Feeling colder with age is not imagined or simply a matter of preference. It reflects a real, measurable decline in the body’s ability to produce heat, conserve heat, and sense temperature accurately. Several systems deteriorate simultaneously: blood vessels in the skin lose their ability to constrict on cue, the body’s internal furnace burns at a lower rate, temperature sensors thin out, and the brain’s thermostat becomes less precise. These changes happen gradually, which is why many people do not notice a dramatic shift but rather a slow drift toward reaching for a sweater more often.
Blood Vessels That Stop Cooperating
When you step outside on a cold day, your body’s first line of defense is to narrow the blood vessels near the skin’s surface. This reflex pulls warm blood away from the cold exterior and keeps it closer to your vital organs. In younger adults, this vasoconstriction kicks in quickly and strongly. In older adults, the response is sluggish and weak. Research has shown that aging impairs both the nerve-driven reflexes and the local signaling pathways in the blood vessel walls themselves, making the problem doubly hard to fix.1PubMed Central. Aging and the control of human skin blood flow The result is that an older person’s body lets heat escape through the skin far more readily than a younger person’s would in identical conditions.
This is not a subtle laboratory finding. Studies of older adults at risk for accidental hypothermia found that those individuals tend to have low resting blood flow to the skin and a pattern of vascular response to cold that essentially fails to constrict at all.2Br Med J. Accidental hypothermia and impaired temperature homoeostasis in the elderly In practical terms, the blood vessels behave as if they did not get the message that the body is cold. A classic review of cold-induced thermoregulation and aging described the inability to reduce heat loss during cold exposure as being primarily associated with diminished responsiveness of the skin’s blood vessels and, to a lesser extent, changes in the insulating properties of body fat.3PubMed. Cold-induced thermoregulation and biological aging
Even in healthy older adults who have no diagnosed vascular disease, the reflex constriction response is measurably impaired. This can compromise the body’s ability to defend its core temperature in situations that a younger person would handle without difficulty, such as sitting in an air-conditioned room or walking to the mailbox in winter.4PubMed. Cold-induced cutaneous vasoconstriction in humans: Function, dysfunction and the distinctly counterproductive
Less Fuel in the Furnace
Your body generates heat as a byproduct of metabolism. Skeletal muscle, even at rest, contributes roughly a fifth of your total resting energy expenditure, and because it makes up about 40 percent of total body mass in a healthy adult, losing muscle means losing a significant heat source.5PubMed Central. Sarcopenia and body temperature—the significance of interorgan metabolic networks in skeletal muscle atrophy After about age 30, people begin losing muscle mass, and the pace accelerates after 60. This process, called sarcopenia, drags down resting metabolic rate and with it the amount of background heat the body produces. Someone with substantially less muscle is, in a literal thermodynamic sense, running a smaller engine.
On top of that, the body has a specialized heat-generating tissue called brown fat. Unlike ordinary white fat, which stores energy, brown fat burns energy specifically to produce warmth. Infants have a lot of it. Adults have less, and older adults have even less than that. Brown fat activity declines progressively with age, and by around the sixth decade of life, this decline plateaus at a low level. Active brown fat is rarely detected in people over sixty.6Geromedicine. Brown adipose tissue decline in aging, a role for autophagy? The loss of this tissue likely contributes directly to the diminished cold tolerance many older people experience. Even the broader category of thermogenic fat tissue declines with aging in ways that are well established, though the downstream metabolic consequences are still being worked out.7PubMed. Aging and Immunometabolic Adaptations to Thermogenesis
A Thermostat That Drifts
The brain’s temperature control center sits in a region called the preoptic area of the hypothalamus. It integrates signals from temperature sensors throughout the body and orchestrates responses such as shivering, sweating, and changes in blood flow. With age, this system becomes less sharp in several ways.
One well-documented change is in the shivering threshold. Shivering is the body’s emergency heat generator, and it normally kicks in when core temperature drops a small amount below normal. In older adults, the trigger point shifts downward, meaning the body allows itself to cool further before it starts shivering. One study found that older adults did not begin shivering until their core temperature had dropped about 0.6°C below its resting level, compared to just 0.2°C in younger adults. Even once shivering started, the older adults produced less metabolic heat from it.8PubMed. Passive temperature lability in the elderly This means older bodies tolerate a wider swing in core temperature before mounting a defense, and the defense they mount is weaker. The researchers described this as greater “passive core temperature lability,” meaning the older body drifts more freely with the environment rather than holding steady.
The circadian rhythm of body temperature also changes. Throughout the day, core temperature normally rises and falls in a predictable cycle, peaking in the late afternoon and dipping overnight. In older adults, this cycle becomes flatter and shifts earlier. One study measured the average core temperature rhythm in elderly subjects and found the baseline was slightly lower and the daily swing was smaller compared to younger adults.9PubMed. The circadian body temperature rhythm in the elderly: effect of single daily melatonin dosing The broader pattern of decreased amplitude, advanced phase, and reduced stability of the circadian temperature rhythm has been confirmed across multiple studies.10PubMed. Circadian and age-related modulation of thermoreception and temperature regulation: mechanisms and functional implications A flatter temperature rhythm may explain why some older adults feel persistently cool rather than cycling through warm and cool periods the way younger people do.
Fewer Sensors in the Skin
Before the brain can respond to cold, it needs to know the cold is there. Temperature information starts with nerve endings in the skin that detect changes in heat and cold. These thermoreceptors thin out with age. A study examining nerve density in human skin found a trend of decreasing epidermal innervation in facial skin with age.11PubMed. Effect of age and anatomical site on density of sensory innervation in human epidermis A broader review concluded that the main causes of reduced thermal sensitivity in older people appear to be aging of the skin itself, reductions in thermoreceptor density, and decreased superficial blood flow. Animal studies also suggest that peripheral nerve fiber loss and slower nerve conduction velocity play a role.12PubMed. Thermal sensitivity in the elderly: a review
This creates something of a paradox. Older people often feel cold, yet their ability to precisely detect temperature changes is actually worse. The subjective experience of “feeling cold” seems to reflect the body’s failure to maintain warmth rather than an overly sensitive detection system. In other words, they feel cold because they are cold, not because they are overly sensitive to cold. Their detection of exactly how cold they are and where, however, is blunted, which makes it harder for the body to mount a targeted response.
Medical Conditions That Make It Worse
The age-related changes described above happen to virtually everyone. But several common medical conditions prevalent in older populations pile on additional cold intolerance.
Hypothyroidism is probably the most well-known. Thyroid hormones are deeply involved in regulating metabolic rate and heat production. A study of patients with even moderate hypothyroidism found that their cold-induced heat generation was reduced, and that restoring normal thyroid hormone levels with medication significantly increased it again.13PubMed Central. Resolution of Hypothyroidism Restores Cold-Induced Thermogenesis in Humans Hypothyroidism becomes more common with age, and because its onset is gradual, it is frequently undiagnosed in older adults. Someone who chalks up feeling cold to “just getting older” may actually have a treatable thyroid condition.
Diabetes, particularly when it has caused nerve damage, is another compounding factor. Diabetic neuropathy impairs the temperature-sensing nerves in the extremities. A study of people with diabetic neuropathy found evidence of poor temperature recovery in the feet after cold exposure, suggesting degeneration of thermoreceptors and diminished signaling to the hypothalamus.14PubMed Central. Cold immersion recovery responses in the diabetic foot with neuropathy The feet of someone with diabetic neuropathy are not just numb to touch; they are also poor at regulating their own temperature.
Iron-deficiency anemia, which is common among older adults due to dietary changes, chronic disease, and gastrointestinal issues, also impairs thermoregulation. People with anemia showed lower skin temperature during cold exposure and failed to increase heat production the way non-anemic individuals did.15PubMed Central. Cardiovascular and Thermal Responses to Cold Exposure During Exercise in Iron-Deficient Anemic Individuals Iron plays a role in oxygen delivery and energy metabolism, so when iron stores are low, the body’s ability to ramp up its metabolic furnace in response to cold is compromised.
Medications That Chill You
Many medications prescribed to older adults have cold extremities as a side effect, and the most well-studied culprits are beta-blockers. These drugs, widely used for high blood pressure and heart conditions, work partly by blocking the receptors that regulate blood vessel tone. Cold hands and feet occur with all beta-blockers, though the effect is smaller with more heart-selective versions.16American Heart Journal. The clinical importance of cardioselectivity and lipophilicity in beta blockers
What surprises many people is that diuretics, another extremely common class of blood pressure medication, also contribute. A study of hypertensive patients found that about 18 percent of those on diuretics developed new complaints of cold extremities, compared to 40 percent of those on beta-blockers.17PubMed. Complaints of cold extremities among patients on antihypertensive treatment Since many older adults take one or both of these medications, the drugs themselves may be responsible for a meaningful share of the coldness people attribute to aging alone. If you have recently started or changed blood pressure medication and notice your hands and feet feel colder, that is worth mentioning to your doctor.
Do Men and Women Experience This Differently?
The conventional wisdom is that women feel colder than men, and there is some truth to this at younger ages, where smaller body size and higher surface-area-to-volume ratios play a role. But the picture changes in older adulthood. A study of Japanese men and postmenopausal women over 50 found that women already had a high prevalence of cold sensitivity at age 50 to 60 and that it did not increase further with aging. Men, by contrast, showed a significant increase in cold sensitivity as they aged. Low body mass index was a significant factor for men but not women.18PubMed. Differences in sensitivity to cold in Japanese men and postmenopausal women aged > or =50 years In other words, older men may be “catching up” to a level of cold sensitivity that women have already been dealing with.
When researchers have controlled carefully for body size and composition, the actual physiological differences in cold tolerance between the sexes appear to be smaller than commonly assumed.19PubMed Central. Influences of ovarian hormones on physiological responses to cold in women Much of what looks like a sex difference is really a body-size difference. Among older adults who have converged in terms of muscle mass loss and declining vascular function, the gap narrows further.
What Actually Helps
Not all of these age-related changes are irreversible. Exercise is one of the more effective interventions, and the mechanism is surprisingly direct. Aerobic training has been shown to improve the skin blood flow responses that deteriorate with age. In one study, 16 weeks of regular cycling improved the body temperature threshold at which skin blood vessels began to open up during heat stress in older men aged 61 to 78. The improvement was actually more pronounced in the older participants than in the younger ones, possibly because they had more room for improvement.20The Journal of nutrition, health and aging. Exercise training and the control of skin blood flow in older adults While that particular study measured vasodilation rather than vasoconstriction, the underlying principle is encouraging: regular physical activity can partially reverse the vascular stiffness and sluggishness that make older adults leak heat.
Exercise also helps preserve muscle mass, which as noted earlier is a major source of resting heat production. Resistance training in particular counteracts sarcopenia, and even modest improvements in lean body mass can bump up resting metabolic rate. This will not restore a 75-year-old’s thermoregulation to what it was at 25, but it can meaningfully reduce the gap.
Beyond exercise, practical environmental strategies matter. Research on elderly care facilities has found that transition spaces, areas between indoors and outdoors where older residents can gradually acclimate to temperature changes, help with thermal adaptation. Activities like sunbathing and light exercise in these spaces support both physical and mental well-being.21Building and Environment. The impact of thermal environment of transition spaces in elderly-care buildings on thermal adaptation and thermal behavior of the elderly Designing living environments with the thermal needs of older adults in mind, rather than defaulting to temperature settings comfortable for younger people, is a practical step that institutions and families can take.
When Feeling Cold Is a Warning Sign
For most older adults, feeling chillier than they used to is an inconvenience managed with an extra layer of clothing and a warmer thermostat setting. But persistent or severe cold intolerance deserves medical attention because it can signal treatable conditions. Undiagnosed hypothyroidism, iron-deficiency anemia, peripheral artery disease, and poorly managed diabetes can all amplify cold sensitivity beyond what normal aging accounts for. A blood test can check thyroid function and iron levels relatively easily.
The more serious concern is accidental hypothermia, which disproportionately affects older adults. The combination of impaired vasoconstriction, a lower shivering threshold, weaker shivering response, and reduced temperature awareness means that an older person’s core temperature can drop to dangerous levels in situations a younger person would tolerate without thinking twice. This is especially true for those living alone, where there may be no one to notice the early signs. Keeping indoor temperatures at or above 68°F (20°C), wearing layers even indoors, and checking on elderly neighbors during cold snaps are straightforward measures that prevent real harm. The physiological changes are real and largely unavoidable, but knowing about them makes it easier to work around them rather than simply endure them.