The Man Who Declared War on Aging
David Andrew Sinclair was born in Sydney, Australia in 1969. He earned his PhD in molecular genetics from the University of New South Wales before moving to MIT as a postdoctoral researcher under Leonard Guarente, where he co-discovered the role of sirtuins — a family of proteins now central to longevity research. In 1999, he established his own lab at Harvard Medical School, where he serves as Professor of Genetics and co-Director of the Paul F. Glenn Center for Biology of Aging Research.
Sinclair's career has been defined by a single provocative claim: aging is a disease, and like any disease, it can be treated. This view puts him at odds with much of the medical establishment, which considers aging a natural process. But Sinclair argues that this distinction is arbitrary and harmful — it prevents the FDA from approving therapies that target aging itself, forcing researchers to treat age-related diseases one at a time instead of addressing their common root cause.
The Information Theory of Aging
Sinclair's central thesis, laid out in his 2019 bestseller "Lifespan: Why We Age — and Why We Don't Have To," is the Information Theory of Aging. The theory distinguishes between two types of biological information:
Genetic information (digital) — the DNA sequence itself, which is remarkably stable and rarely the cause of aging.
Epigenetic information (analog) — the chemical marks and protein structures that tell each cell which of its 20,000+ genes to read. This is the "software" that makes a skin cell different from a neuron, even though they share identical DNA.
Sinclair argues that over time, as cells respond to damage — DNA breaks from UV radiation, toxins, normal metabolism — the epigenetic machinery gets disrupted. Sirtuins, which normally maintain the epigenome, get pulled away to help repair DNA damage. Each repair cycle introduces a small amount of epigenetic noise. Over decades, cells gradually lose their identity. A liver cell starts expressing genes it shouldn't. A muscle cell becomes less efficient. This progressive loss of cellular identity, Sinclair says, IS aging.
The revolutionary implication: if aging is caused by information loss in the epigenome, and if that information is backed up somewhere in the cell (as Sinclair's lab has shown in mice), then aging can theoretically be reversed — not just slowed.
The Yamanaka Factor Experiments
In 2020, Sinclair's lab published a landmark study in Nature demonstrating that they could reverse aging in mouse eyes. Using three of the four Yamanaka factors (Oct4, Sox2, and Klf4 — collectively known as OSK), the team reprogrammed retinal ganglion cells in old mice, restoring youthful gene expression patterns and recovering vision loss from glaucoma and natural aging.
This was the first demonstration that epigenetic reprogramming could reverse aging in a living animal without causing tumors — a critical safety concern with full Yamanaka factor reprogramming. The work suggested that cells retain a "backup copy" of their youthful epigenetic state, and that this backup can be accessed to reset cellular age.
In December 2023, Sinclair's lab followed up with a study showing whole-body epigenetic reprogramming could extend lifespan in mice, using a carefully dosed gene therapy approach. The results were modest but significant: treated mice lived about 7% longer on average, with improved organ function across the board.
NAD+ and Resveratrol: The Supplement Connection
Sinclair is perhaps best known publicly for his work on two molecules: resveratrol and NAD+ (nicotinamide adenine dinucleotide).
Resveratrol — found in red wine — was shown by Sinclair's lab in 2003 to activate sirtuin proteins, extending lifespan in yeast, worms, and mice on high-fat diets. The findings were controversial; some labs failed to replicate them, and GlaxoSmithKline's $720 million acquisition of Sirtris Pharmaceuticals (Sinclair's company) was widely seen as a cautionary tale when the drug program was shuttered in 2013. Sinclair maintains that resveratrol works but requires NAD+ to function optimally.
NAD+ — a coenzyme essential for cellular metabolism — declines dramatically with age. Sinclair's lab showed that boosting NAD+ with precursors like NMN (nicotinamide mononucleotide) could restore youthful gene expression in old mice, improve blood flow, increase endurance, and reverse aspects of aging in multiple organs. Sinclair himself takes NMN daily and has been public about his personal supplement regimen, which also includes metformin, vitamin D, and vitamin K2.
The NMN research led to a booming supplement industry, though the FDA controversially attempted to ban NMN as a dietary supplement in 2022, classifying it as an investigational drug. The decision remains contested.
Controversy and Criticism
Sinclair is both the most famous and most polarizing figure in longevity science. Critics — including some prominent aging researchers — have accused him of overhyping preliminary results, blurring the line between scientist and supplement promoter, and making claims that outpace the evidence.
The most significant controversy erupted in 2023 when other researchers were unable to fully replicate some of the mouse epigenetic reprogramming results. Sinclair's lab responded with additional data and methodology details, but the episode underscored the challenges of working at the frontier of a field with enormous commercial implications.
Despite the controversies, Sinclair's impact is undeniable. He has published over 200 papers (many in Nature, Science, and Cell), holds 50+ patents, has been named to Time's 100 most influential people, and has done more than perhaps anyone to bring aging research into mainstream conversation. His core insight — that aging is an information problem — has been validated by multiple independent labs and is now a central framework in the field.
What Sinclair Takes (His Personal Protocol)
Sinclair has been unusually transparent about his personal longevity regimen. As of his most recent public disclosures, his daily protocol includes:
- NMN (1 gram/day) — NAD+ precursor
- Resveratrol (1 gram/day) — sirtuin activator, mixed with yogurt for absorption
- Metformin (1 gram/day) — diabetes drug used off-label for longevity (AMPK activator)
- Vitamin D3 — immune and bone health
- Vitamin K2 — calcium metabolism
- Statin (prescribed) — cardiovascular risk reduction
- Low-dose aspirin — anti-inflammatory
- Fasting — skips breakfast, eats one large meal per day
- Exercise — high-intensity interval training and weight training
- Cold exposure — cold plunges for stress response activation
- Blood testing — regular biomarker panels including biological age tests
He has reported that his biological age, as measured by DNA methylation clocks, is approximately 10 years younger than his chronological age. He emphasizes that this is his personal experiment and not medical advice.
