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Longevity Science Is Overhyped. But This Research Really Could Change Humanity.
A new therapy has the potential to cure hundreds of diseases — and even reverse aging.
Credit...
Photo illustration by Kensuke Koike
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By
Susan Dominus
April 27, 2026
Why are babies born young?
The most natural phenomenon on earth is actually hard to explain — at least on a cellular level. Consider this problem: The components of conception are old. When a woman gets pregnant, she has been carrying her egg cells since birth. The sperm that joins with the egg to form a zygote might have been just a few months in the making, but it inherits markers of age from the man who produced it. It only follows that the zygote would also show signs of age — and at first it does.
But then a mysterious metamorphosis begins: The cells of the zygote begin to reverse that damage, shaking off the metaphorical dust that the parents accumulated on their DNA. After two weeks, the cells of the embryo are back to a kind of ground zero of youth. Only then are they as young as they will ever be. To understand this process, which was discovered only recently and is
known as “natural rejuvenation,”
is to contemplate a mind-bending truth: We don’t start out young; we work our way back to it.
Many scientists now believe that mastering cellular rejuvenation may be the key to transforming how long and how well we live. Some hope that they might eventually be able to harness the process to cure hundreds of diseases, extend life by decades and even fend off aging entirely.
Over the past 20 years, they have learned how to trigger rejuvenation in the lab, achieving a series of breakthroughs that have made that future feel tantalizingly close. Scientists have taken skin cells from 90-year-olds and restored them to youth in a petri dish. They have rejuvenated diseased mice, turning their gray hair back to black and strengthening their muscles. They have taken failing kidneys out of rats, rejuvenated them in a lab and successfully reimplanted them; they are now moving on to pigs. In March,
the
first safety trials
to test rejuvenation therapy on humans began with an attempt to reverse disease in the eyes and cure glaucoma.
Rejuvenation is one of the newest and most promising developments in longevity research, a field that began in earnest in 1993 when a scientist at the University of California, San Francisco, proved that she could
double the life span
of a roundworm simply by tweaking a single gene. Since then, research devoted to how we age has exploded, developing alongside a booming longevity industry led by entrepreneurs and even some scientists pushing unproven products. Peptides, supplements, laser therapies, electric suits, collagen powders, cryotherapies, blood infusions and other offerings claiming to slow aging now constitute a $20 trillion global market.
Fueling this industry are some of the wealthiest men in the world, who are trying to finance their way to longer life, either by biohacking their own health or pouring money into the research. Major figures in Silicon Valley, including Peter Thiel, Larry Ellison and Sam Altman, have collectively invested billions in biotech companies and research centers devoted to slowing the aging process.
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