About 0.03% of the U.S. population is currently aged 100 or older. But the more useful number is this: out of every 100,000 babies born today, roughly 710 males and 2,205 females will survive to their 100th birthday, based on the Social Security Administration’s 2022 life tables. That translates to about 0.7% of men and 2.2% of women.
Your Odds Depend on When You Were Born
There are two ways to think about this question, and they give different answers. The first is a snapshot: how many centenarians are alive right now compared to the total population? In the U.S. in 2021, there were 89,739 people aged 100 or older out of roughly 337 million, a prevalence of 0.027%. That number is small because it only counts people who have already made it, not those who eventually will.
The second way is forward-looking: if you take a group of babies born today and track them through their entire lives, how many will reach 100? The Social Security Administration projects that about 3% of females and 1% of males from the 2019 birth cohort will get there. These projections assume current mortality rates hold steady. If medical advances continue, the real numbers could be higher.
Women Outlive Men by a Wide Margin
The gender gap in extreme longevity is striking. Women are roughly three times more likely than men to reach 100. For every 100,000 people born, about 2,205 women but only 710 men survive to that age. The gap starts well before 100: by age 65, about 86,231 women are still alive out of the original 100,000, compared to 77,402 men. But the disparity widens dramatically in the decades after that.
If you’re already 65, your odds improve slightly because you’ve already survived the risks of younger adulthood. A 65-year-old woman has roughly a 2.6% chance of reaching 100, while a 65-year-old man has about a 0.9% chance.
Where People Live Longest
Centenarians are not evenly distributed around the world. Okinawa, Japan, has one of the highest concentrations anywhere, with about 1 centenarian for every 2,000 residents. In the U.S., the national proportion is about 2.42 centenarians per 10,000 people, and the centenarian population grew by 50% between 2010 and 2020.
Globally, the centenarian population is growing fast. In 1990, there were 2.9 centenarians for every 10,000 adults aged 65 and older worldwide. By 2015, that share had jumped to 7.4. Pew Research Center projections put the global centenarian population at 3.7 million by 2050, with the rate climbing to 23.6 per 10,000 older adults.
Genetics vs. Lifestyle
About 25% of the variation in human lifespan is determined by genetics. For the first seven or eight decades of life, lifestyle choices like diet, exercise, smoking habits, and social connections are a stronger influence on how long you live. After that, genetics plays a progressively larger role in keeping people healthy into their eighties and beyond. This helps explain why centenarians often cluster in families: they tend to carry genetic variants that protect against age-related diseases.
That said, the 75% that isn’t genetic is significant. Most of the modifiable risk happens in middle age, which means the decisions you make in your 40s, 50s, and 60s have a larger impact on your chances than your DNA does.
What Life at 100 Actually Looks Like
Reaching 100 is one thing. Reaching it in good health is another. A meta-analysis of 18 studies found that about 65% of centenarian women and 58% of centenarian men have some form of cognitive impairment. Dementia prevalence is similarly high, affecting roughly 65% of women and 56% of men at that age.
Physical independence is even harder to maintain. Around 92% of centenarian men and 85% of centenarian women in population-based studies had difficulty performing at least one basic daily activity like bathing, dressing, or eating without help. That leaves only about 8% of men and 15% of women at 100 who are fully independent in their daily routines.
These numbers don’t mean every centenarian is bedridden. A meaningful minority, roughly 35 to 42%, remain cognitively intact. Researchers studying this group have found they often share traits like resilience, social engagement, and the ability to manage stress, qualities that may be just as important as physical health in reaching extreme old age.
The Centenarian Population Is Accelerating
The number of people reaching 100 is climbing rapidly. The U.S. centenarian population grew 50% in a single decade, and globally the trend is even steeper. By 2050, projections put the worldwide centenarian population at 3.7 million, an eightfold increase from recent levels. Improvements in healthcare, nutrition, and childhood survival rates are all contributing factors.
Living to 100 is still rare, but it’s becoming significantly less rare with each generation. A child born today has roughly 20 to 30 times the chance of reaching 100 compared to someone born a century ago. Whether those extra years will be healthy ones is the question researchers are now focused on.