In 1950, there were about 23,000 people alive who had reached the age of 100. The entire group would've fit in Madison Square Garden with seats to spare. They were extreme outliers. Curiosities. A small rounding error in the global census.
Today, that number is closing in on one million. According to the United Nations Population Division, roughly 935,000 centenarians were alive in 2024. And projections put the number at 3.7 million by 2050.
That's a 160-fold increase in one century. The club that barely existed in 1950 is about to be the size of Los Angeles.
So What Actually Happened?
The short version: the floor keeps rising. Medical science happened. Sanitation happened. We wiped out or tamed the diseases that used to kill people before their fiftieth birthday. Smallpox. Cholera. Tuberculosis. Polio. Measles. Gone or mostly gone from most of the world. The average person born in 1900 had a global life expectancy of around 32 years. Today it's 73. And in wealthier countries it's pushing 80 to 85.
But here's the thing: reaching 100 isn't just about avoiding early death. Centenarians aren't people who got lucky and dodged some buses. They're people who aged well. That's a different thing entirely, and researchers are still figuring out the exact recipe.
What they do know is that the growth is accelerating, not slowing. In 1990, there were about 110,000 centenarians worldwide. In 2020, the count was 573,000. In 2024, it's pushing 935,000. We're roughly doubling the population every decade.
Japan Is Doing Something Different
To understand centenarians, you have to talk about Japan. In 2025, Japan became the first country in the world to have 100,000 people aged 100 or older. The Japanese government publishes a centenarian report every single September, and every year it's a new record. They've been doing this since 1963, when there were exactly 153 centenarians in the whole country.
That ratio works out to about 80 centenarians per 100,000 people, one of the highest rates on Earth. And about 88 percent of them are women. This isn't a Japan-specific quirk. Globally, roughly 85 to 90 percent of all centenarians are female. Nobody has a clean explanation for this, but the theories include stronger immune systems in women, lower rates of cardiovascular disease at younger ages, and the plain historical fact that men have spent more of their lives doing dangerous things.
Okinawa, Japan's southwestern island chain, has become a kind of pilgrimage site for longevity researchers. They've been studying its elders for decades. Part of it is the diet. Part of it is tight social networks. But a lot of attention has landed on a practice called hara hachi bu, a Confucian principle that Okinawans have turned into a daily habit: stop eating when you're about 80 percent full.
That's the secret. Not a pill. Not a supplement. Not some impossible genetic lottery. Just... put the fork down before you're stuffed. The practical result is that Okinawan elders tend to maintain healthy body weight well into old age, which turns out to matter enormously for making it to 100.
Japan hit 100,000 centenarians in 2025. In 1963, when they started counting, there were 153.
France's Unlikely Record
Japan gets the headlines, but France is quietly running its own extraordinary centenarian story. As of 2024, France has about 31,000 centenarians, giving it a rate of roughly 47 per 100,000 people. For a country of 68 million, that's genuinely impressive.
But France holds the all-time record for a different reason. Jeanne Calment, born in Arles in 1875, died in 1997 at the verified age of 122 years and 164 days. She is the oldest confirmed human being in recorded history. She was alive when the Eiffel Tower was under construction. She reportedly sold colored pencils to Vincent van Gogh as a teenager. She outlived her daughter and her grandson.
She also smoked until she was 117.
That last detail has haunted longevity researchers ever since. The woman who holds the record for longest confirmed human life was a smoker for a century. It is, by almost any measure, deeply unfair to every data model in existence.
Who's the Oldest Person Alive Right Now?
As of early 2026, the world's oldest validated living person is Ethel Caterham of the United Kingdom, born on August 21, 1909. She's 116 years old.
Think about what that timeline covers. Ethel was born eight years before the United States entered World War I. She was 30 when World War II began. She's lived through the invention of commercial aviation, television, the moon landing, personal computers, the internet, and the iPhone. Every single person who was alive when she was born is now gone. She has outlived an entire generation of humanity.
Beyond centenarians, there's an even smaller group called supercentenarians, people who've reached 110. Researchers estimate that somewhere between 300 and 450 supercentenarians are alive at any given time. But because birth records from 110+ years ago are patchy in many parts of the world, the true number is uncertain. The actual oldest living person might be someone nobody has ever documented.
What Are Your Odds?
The UK's Office for National Statistics estimated in 2013 that one in three babies born that year in the UK would live to 100. Not a rare outlier. Not a statistical anomaly. One in three.
That figure applies roughly to babies born in wealthy countries with modern healthcare. Japan, France, Australia, Canada, Scandinavia. The picture is different in countries with lower life expectancy, but the global trend points in one direction and it's not down.
The babies born in 2025 may have close to a coin-flip shot at their hundredth birthday. That is a genuinely staggering thing to say out loud.
What This Actually Means
The centenarian explosion is one of the clearest possible measurements of human progress. You can't fake a 160-fold increase in people reaching 100. It's not a statistical quirk. It's a direct readout of everything humanity has done right in nutrition, medicine, sanitation, and quality of life over the past century.
People are reaching 100 not because they got genetically lucky. They're reaching it because the floor of what's survivable keeps rising, and because more and more people are living long enough to find out what their body is actually capable of.
The oldest verified living person right now, Ethel Caterham, was born in 1909. The person who will become the oldest alive in 2075 was probably born around 2005 or 2010. They're a teenager right now, have no idea they're going to outlive almost everyone they've ever met, and are almost certainly looking at their phone.
In 2050, when 3.7 million people are 100 or older, we're going to need a bigger club.