For as long as human beings have grown old, we have searched for ways to slow aging.
In ancient times, people searched for fountains of youth.
Today, we have podcasts, supplements, injections, longevity clinics, and Internet advertisements promising almost the same thing—only with better graphics.
So let’s begin with the most important fact:
As of 2026, there is no FDA-approved medication specifically proven to slow human aging or extend human lifespan.
But that does not mean the science is nonsense.
Quite the opposite.
Researchers are beginning to understand the biological processes that cause our bodies to become more vulnerable to disease as we age. The National Institute on Aging calls this field geroscience—the study of how the biology of aging contributes to chronic diseases such as cancer, cardiovascular disease, diabetes, dementia, and frailty.
The idea is fascinating.
Instead of treating heart disease, diabetes, Alzheimer’s disease, arthritis, and other age-related illnesses completely separately, what if scientists could influence some of the biological processes that contribute to many of them at once?
That could change medicine.
But we need to distinguish between what is promising, what is proven, and what is simply being sold to us.
Rapamycin: Probably the Most Famous Longevity Drug
If you follow longevity research, you have probably heard about rapamycin, also called sirolimus.
Rapamycin has generated enormous excitement because it influences a biological pathway called mTOR, which helps cells regulate growth, metabolism, and responses to nutrients.
In numerous animal experiments, manipulating the mTOR pathway has produced impressive effects on lifespan and age-related disease.
That has led researchers to ask the obvious question:
Could rapamycin slow aspects of aging in humans?
We do not yet know.
Clinical trials are underway in older adults investigating rapamycin or related drugs for measures of aging, physical function, immune function, cognitive health, and other outcomes. One current randomized study specifically examines rapamycin’s safety and effectiveness on clinical measures associated with aging in older adults. Other trials are studying sirolimus as a possible way to reduce functional decline.
There have also been small human studies suggesting that mTOR inhibition may influence immune function in older adults. But that is very different from proving that rapamycin makes healthy people live longer.
Rapamycin also has real risks. At doses used medically, it can affect immune function and cause side effects.
So despite what you may hear in longevity circles, rapamycin is not currently an established anti-aging prescription for healthy adults.
The appropriate label today is:
Very interesting. Very promising. Still experimental for longevity.
Metformin: The Old Diabetes Drug With a Longevity Reputation
Metformin may be the best example of an old medicine receiving a completely new reputation.
Doctors have prescribed it for decades to treat type 2 diabetes.
Researchers became interested in metformin because of observations suggesting that it may influence pathways associated with metabolism, inflammation, and aging.
A small human study called MILES examined whether metformin could affect biological processes associated with aging. Researchers have also developed aging-related biomarker programs connected with the proposed Targeting Aging with Metformin, or TAME, research effort.
But again, there is an important distinction:
Metformin is a proven diabetes medicine. It is not a proven longevity medicine.
We do not currently have definitive evidence that a healthy person without diabetes will live longer by taking metformin.
And medications have consequences.
Metformin can cause gastrointestinal problems and has been associated with reduced vitamin B12 levels in some people taking it long-term.
That is one reason taking prescription medications simply because they are fashionable in the longevity community deserves caution.
A medication should solve a problem—not merely satisfy our desire to do something.
For more discussion of aging as something broader than simply accumulating birthdays, see Elderhood’s article Aging Is Inevitable. Decline Is Not..
Senolytics: Getting Rid of “Zombie Cells”
Now we get into one of the most interesting areas of aging science.
As we grow older, some damaged cells stop dividing but do not die.
These are called senescent cells.
You may hear them described more colorfully as “zombie cells.”
They remain in tissues and can release inflammatory substances that may contribute to age-related dysfunction.
Scientists are studying medications called senolytics, designed to selectively eliminate some of these senescent cells.
The theory is appealing:
If problematic senescent cells contribute to deterioration, perhaps removing some of them could improve tissue function.
Researchers are testing combinations including dasatinib and quercetin, as well as compounds such as fisetin, in human studies involving older adults and age-related conditions. ClinicalTrials.gov currently lists trials examining senolytic approaches for bone health, cognitive impairment, mobility, and other age-associated problems.
But this field remains experimental.
Dasatinib, for example, is a powerful prescription cancer drug—not something people should casually add to a home longevity program.
Even seemingly familiar compounds can behave differently when used at therapeutic doses or in combinations.
Senolytics are exciting science.
They are not yet established anti-aging therapy for the general public.
NAD Boosters: Popular, but the Evidence Has Not Caught Up With the Marketing
Another enormous longevity industry has developed around NAD+.
NAD is a molecule involved in cellular energy production and many other biological processes.
Levels of NAD-related metabolites can change with age, leading researchers to investigate compounds such as nicotinamide riboside, or NR, and nicotinamide mononucleotide, or NMN.
Human trials show that NR can raise NAD-related levels and is generally well tolerated in studied doses.
That sounds encouraging.
But here is the question that matters:
Does raising NAD make humans live longer or remain healthier for substantially longer?
We do not yet have convincing evidence that it does.
Reviews of human supplementation studies repeatedly point out that although NAD precursors alter biological markers, translating those changes into major clinical benefits remains uncertain.
This is a good example of the difference between changing a laboratory measurement and changing a life.
A supplement may move a biomarker.
That does not automatically mean you will avoid dementia, remain stronger at 90, or live five additional years.
GLP-1 Drugs: Not Anti-Aging Drugs, but Potentially Important for Healthspan
What about drugs such as semaglutide?
GLP-1 medications were developed primarily for diabetes and obesity, not to slow aging.
However, they illustrate something important about the future of longevity medicine.
Semaglutide has demonstrated benefits beyond weight loss in appropriate patients, including reductions in cardiovascular risk and benefits involving diabetes and kidney disease.
That does not make semaglutide an “anti-aging drug.”
But if a treatment reduces obesity, improves metabolic health, and lowers the likelihood of certain major diseases, it may help some people maintain better health as they age.
That brings us to an important distinction:
Lifespan is how long you live.
Healthspan is how long you remain healthy and functional.
Medicine may make tremendous progress extending healthspan long before anyone proves that a particular pill adds twenty years to human lifespan.
That may actually be the more important goal.
At Elderhood, we have argued that the objective should not simply be adding years, but maintaining strength, independence, curiosity, and function for as long as possible. Read more about healthy aging at Elderhood.info.
What About Supplements That Claim to Reverse Aging?
This is where skepticism becomes particularly useful.
The supplement industry can move much faster than medical science.
A laboratory study comes out Monday.
By Friday, somebody is selling a bottle claiming to “activate longevity genes.”
Be careful.
Terms such as:
“age reversal,”
“cellular rejuvenation,”
“biological age reduction,”
“longevity activation,”
can sound scientific while telling you very little about whether a product has been proven to improve meaningful human health outcomes.
The FDA has repeatedly taken action when products marketed with anti-aging or disease-treatment claims cross regulatory lines without appropriate evidence.
That does not mean every supplement is worthless.
It means the burden of proof should belong to the person selling it—not to your imagination.
Biological Age Tests: Interesting, but Don’t Confuse the Score With Your Birthday
Longevity medicine has also produced a growing fascination with biological age.
Tests may analyze DNA methylation, proteins, blood markers, or other measurements and estimate whether your biology appears “younger” or “older” than your chronological age.
These tools can be scientifically interesting.
Researchers themselves are studying biological aging markers in major longitudinal projects.
But if your biological-age report says you became six years younger after taking a supplement for three months, that does not mean you literally reversed six years of human aging.
Biomarkers are tools.
They are not immortality certificates.
So What Actually Works Today?
Here is the mildly frustrating part.
The strongest evidence for healthy aging still involves things that cannot be patented as a miracle pill.
Physical activity.
Maintaining muscle.
Not smoking.
Managing blood pressure.
Maintaining metabolic health.
Sleeping adequately.
Eating a reasonably healthy diet.
Maintaining social connection.
Receiving appropriate preventive medical care.
That may sound less exciting than rapamycin or gene editing.
But the goal is not to win the most futuristic medicine cabinet.
The goal is to remain functional long enough to benefit from the treatments that really do prove themselves.
If you want professional guidance in this rapidly developing field, Elderhood also has a guide on finding a doctor who focuses on living longer and healthier.
The Real Longevity Revolution
I think we are witnessing something important.
For most of medical history, aging itself was treated as inevitable background noise.
You developed arthritis—we treated the arthritis.
You developed heart disease—we treated the heart disease.
You developed diabetes—we treated the diabetes.
Geroscience is asking a bigger question:
Why do all these diseases become more common as we age, and can we intervene earlier in the biological processes they share?
That may ultimately lead to medicines that genuinely slow aspects of biological aging.
Rapamycin may contribute.
Metformin may contribute.
Senolytics may contribute.
NAD-related therapies may contribute.
Or the eventual winners may be medicines we have not even invented yet.
We simply do not know.
And anybody claiming certainty today is getting ahead of the evidence.
The Elderhood Bottom Line
There is a middle ground between cynicism and gullibility.
We should not laugh at longevity medicine.
Serious scientists are studying it.
Clinical trials are happening right now.
But we also should not turn ourselves into human laboratory experiments because somebody with a podcast says he takes twelve pills before breakfast.
The sensible approach is:
Use medicines today for conditions where their benefits are established.
Watch longevity research closely.
Discuss experimental approaches with qualified physicians rather than self-prescribing.
And most importantly:
Protect the health you already have.
Because the great promise of longevity science is not necessarily that we will someday live forever.
It is that we may learn how to stay healthier much longer.
And that brings us back to the Elderhood philosophy:
Stay healthy until the cavalry arrives.
Rapamycin, senolytics, gene therapy, artificial intelligence, regenerative medicine—somewhere among these technologies may be treatments that substantially change aging.
But we have to be here to benefit from them.
So exercise today.
Protect your muscle today.
Control your blood pressure today.
Take care of your brain today.
And remain curious about tomorrow.
Because the real anti-aging breakthrough may not have arrived yet.
But for the first time in human history, serious medicine is beginning to look for it.