Most people with diabetes live into their 60s, 70s, and beyond, but the condition does shorten life expectancy by roughly 5 to 14 years depending on the type of diabetes, when it’s diagnosed, and how well it’s managed. That’s a wide range, and where you fall within it depends largely on factors you can influence.
Type 1 vs. Type 2: The Numbers
A large meta-analysis published in Frontiers in Endocrinology found that men with type 1 diabetes live an average of 65 years, while women with type 1 live about 68 years. That translates to roughly 11 years of life lost for men and nearly 11 for women compared to people without diabetes. These are averages across many countries and time periods, so individual outcomes vary considerably. People with consistent access to modern insulin therapies and glucose monitoring technology now have a life expectancy approaching that of the general population.
Type 2 diabetes generally has a smaller impact on lifespan, but the age you’re diagnosed matters enormously. Research published in The Lancet Diabetes & Endocrinology found that in the U.S., a person diagnosed with type 2 at age 30 dies about 14 years earlier than someone without diabetes. Diagnosed at 40, that gap shrinks to 10 years. Diagnosed at 50, it’s about 6 years. The pattern is consistent: every decade of earlier diagnosis costs roughly 3 to 4 additional years of life. European data showed nearly identical trends.
What Actually Shortens Life With Diabetes
Diabetes itself isn’t usually what kills. It’s the long-term damage that elevated blood sugar causes to blood vessels throughout the body. Over years and decades, that damage accumulates in predictable places: the heart, kidneys, eyes, and nerves in the extremities. Heart attacks and strokes are the biggest killers. About 11% of all cardiovascular deaths globally are caused by high blood glucose, and diabetes combined with kidney disease accounted for over 2 million deaths in 2021 alone.
Kidney failure is the second major threat. Persistently high blood sugar gradually destroys the tiny filtering units in the kidneys, and once kidney function declines past a certain point, dialysis or transplant becomes necessary. Nerve damage in the feet, combined with poor circulation, can lead to ulcers that won’t heal and sometimes require amputation. Vision loss from damaged blood vessels in the eyes is another common complication that, while not directly fatal, signals the kind of widespread vascular damage that shortens life.
How Other Health Conditions Stack the Odds
High blood pressure is extremely common alongside type 2 diabetes, and the combination is far more dangerous than either condition alone. Research from Columbia University found that having both type 2 diabetes and high blood pressure doubles the risk of dying from any cause and triples the risk of dying from cardiovascular disease, compared to having neither condition. Even compared to having diabetes alone, adding high blood pressure raises the risk of dying from heart disease by more than double.
Smoking is the other major multiplier. Smoking alone shortens life by about 6 years. Diabetes alone shortens it by about 9 years. But the two together don’t simply add up. Smokers with diabetes lose roughly 15 years of life expectancy and face quadruple the risk of dying from heart disease compared to nonsmokers without diabetes. Quitting smoking is one of the single most impactful things a person with diabetes can do for longevity.
Why Early Diagnosis Changes Everything
The Lancet data makes a compelling case for catching type 2 diabetes as early as possible. A person diagnosed at 30 faces 14 years of reduced life expectancy, but someone diagnosed at 50 faces only 6. That’s not just because the younger person lives with diabetes longer. Earlier onset means more years of blood sugar damage accumulating during a period of life when people are less likely to take it seriously or manage it aggressively. The blood vessel damage that leads to heart attacks and kidney failure is cumulative, so every year of poorly controlled blood sugar adds to the total burden.
This is why screening matters, especially if you have risk factors like obesity, a family history of diabetes, or belong to a population with higher rates of the disease. Many people with type 2 diabetes have elevated blood sugar for years before they’re formally diagnosed. Catching it earlier means starting management earlier, which means less cumulative damage and a longer life.
How Management Affects Survival
The gap between well-managed and poorly managed diabetes is enormous. Modern tools have made a measurable difference. Continuous glucose monitors, which track blood sugar levels in real time through a small sensor under the skin, have been linked to a 43% reduction in mortality among insulin-treated older adults compared to traditional finger-prick testing. That’s not a small effect. These devices help people catch dangerous blood sugar swings before they cause immediate harm, and over time, the tighter control they enable reduces the slow vascular damage that leads to complications.
Blood sugar control is the central lever. Keeping your average blood sugar levels in a healthy range, measured by the A1C test your doctor orders every few months, slows or prevents nearly every major complication of diabetes. The target for most people is an A1C below 7%, though your doctor may set a different goal based on your age and other health conditions.
Beyond blood sugar, managing blood pressure and cholesterol is equally critical for survival. Since cardiovascular disease is the leading cause of death in people with diabetes, treating these related conditions aggressively can close much of the life expectancy gap.
Access and Inequality Shape Outcomes
Not everyone with diabetes faces the same prognosis. The CDC reports that racial and ethnic minority groups and people with lower incomes have historically had higher rates of illness and death from diabetes, and that gap has not substantially narrowed. Social factors like where you live, what healthcare you can access, and whether you can afford medications and healthy food account for 50% to 60% of health outcomes.
Parts of Appalachia, sometimes called the “diabetes belt,” illustrate this clearly: high rates of diabetes combined with significantly less access to healthcare than the rest of the country. The life expectancy figures cited above are averages, but a person with diabetes and reliable access to an endocrinologist, modern medications, and glucose monitoring technology will have a very different trajectory than someone managing the condition with limited resources.
How Far Treatment Has Come
It’s worth putting current numbers in perspective. Before insulin was discovered in 1922, type 1 diabetes was a death sentence, often killing children and young adults within months of diagnosis. The first patient treated with insulin, a teenager named Leonard Thompson, went from near death to recovery in a matter of days. Today, people with type 1 diabetes who have access to modern insulin formulations and monitoring technology can expect a lifespan approaching that of someone without the condition.
Type 2 diabetes treatment has undergone its own transformation. Newer classes of medications not only lower blood sugar but also protect the heart and kidneys directly, addressing the complications that historically killed people with the disease. The life expectancy gap for type 2 diabetes has been narrowing in high-income countries over the past two decades, and the trend is likely to continue as these treatments become more widely used.