Longevity Escape Velocity: When Will Science Outrun Aging?

The two longevity numbers at the top of every page, what they mean, and how we made our estimate.

The two numbers at the top of every page

At the top of every page there is a LONGEVITY box with two numbers. The first is how much longer people are expected to live than they were one year earlier. The second is our best estimate of the year science reaches longevity escape velocity. Here is what both mean, in plain English.

What is longevity escape velocity?

Imagine walking up an escalator that is moving down. If you walk slower than the escalator, you slowly sink toward the bottom. If you walk exactly as fast as it moves, you stay in place. If you walk faster, you climb, even though the stairs are still moving down.

Aging is the down escalator. Every year that passes, each of us gets one year older. Medicine is our walking. Today medicine adds some time to our lives each year, but less than a full year, so we still sink, slowly. Longevity escape velocity is the day medicine starts adding more than one year of expected life for every year that passes. From that day on, for people who can get the treatments, time would stop running out faster than science can give it back.

It does not mean nobody dies. Accidents and illness still happen. It means aging itself stops winning the race. For the first time in history, serious scientists are debating a date for that.

Number one: life expectancy gained

The newest full year of official numbers is 2024. That year, a baby born in the United States could expect to live 79.0 years, the highest ever recorded, up from 78.4 years in 2023. That is a gain of 0.6 years, about seven months, in a single year. Source

To reach escape velocity, that number has to reach 1.0 and stay there, year after year.

One honest caution: part of the recent gains came from the country recovering after COVID and from fewer overdose deaths, not only from new medicine. Over the long run, the longest-lived countries in the world have gained about six and a half years of life expectancy since 1990, roughly 0.2 years a year, according to a 2024 study in Nature Aging.

The 2025 number should be another record. The CDC's early count shows the 2025 death rate fell 4.6% to the lowest ever recorded in the United States. Source We update this number each time the CDC publishes a new year.

Number two: our estimate, and the math behind it

We believe longevity escape velocity will arrive within the next decade, so we started our estimate at 2036, ten years from the day we began tracking it. From here, the numbers decide. Every time the CDC publishes a new year, we feed it into the math and the estimate moves.

The math, in plain English. Big inventions rarely grow in a straight line. They grow in an S-curve: slow at first, then faster and faster, then leveling off. Think of a new phone. A few people have one, then suddenly everyone does, then nearly everyone already has one. We expect the fight against aging to follow the same S shape, and we think the fast part of the curve is about to begin.

So we draw an S-curve through the yearly gains. When the curve reaches a gain of 1.0 year per year, that is escape velocity, and that is the year at the top of the page.

How the estimate moves. With only one year of data, the curve runs from the latest gain to our starting estimate. Each new year of data gets more say than our starting guess. After two years of data, the data counts for half. After three, two thirds. After ten, nine tenths. Some examples of how it would move:

• If the next two years come in at 0.7 and then 0.9 years, the curve bends up fast and the estimate jumps to 2027.
• If they come in at 0.65 and then 0.7, the estimate moves to 2032.
• If next year comes in at only 0.62, the estimate slips to 2038.
• If gains shrink instead of grow, we will say so plainly: the strip will read "Not yet in sight" until they start rising again.

The speculative part. No one knows the exact shape of the curve. We assume the yearly gain could at most reach about two years per year, which sets how the S bends. That is a guess, and we say so. It is the kind of guess that gets better as real numbers arrive, which is the point.

What the experts say

• Ray Kurzweil, the inventor and futurist, said in 2024 that we will reach it between 2029 and 2035, with AI helping to simulate biology. Source
• Aubrey de Grey, the biologist best known for the idea, said in 2021 that he saw a 50% chance of reaching it by 2036. Source
• Peter Diamandis said in 2025 that healthy people of reasonable means could reach it "sometime in the next decade." Source
• George Church, the Harvard geneticist, said in 2025 he would not be surprised if it came around 2050. Source
• The forecasting crowd: on Metaculus, a site where about 150 people make tracked predictions, the middle guess for when a country first sees life expectancy rise by at least one year per year, and keep rising that fast, is late 2053, as of Oct. 25, 2026. Source
• The skeptics: S. Jay Olshansky and colleagues argued in Nature Aging in 2024 that big jumps in lifespan are unlikely this century unless science learns to slow aging itself. Source

We sit with the optimists, and we let the data keep us honest. Every change to the estimate shows on the Dashboard. If we are right, many of the people reading this tonight will be here to see it.