David Sinclair: Can Aging Be Reversed?After 8 Weeks, Cells Appeared 75% Younger In Tests!

What It Covers

Harvard professor David Sinclair, who has spent 30 years researching aging at Harvard Medical School, presents his information theory of aging — the idea that cells lose their epigenetic identity over time — and explains how his lab has reversed aging in mice by up to 100% remaining lifespan extension, with the first human trials targeting blindness launching within weeks of recording.

Key Questions Answered

• •Information Theory of Aging: Aging is not simple cellular wear-and-tear but an epigenetic identity crisis. Cells lose the chemical markers (methyl groups on DNA) that tell them whether to behave as nerve, skin, or liver cells. Sirtuins — the proteins that maintain this identity — get distracted repairing broken chromosomes and never fully return to their original positions. This cumulative drift is what Sinclair identifies as the primary driver of aging, disease, and death.
• •Age Reversal via Three Genes: Sinclair's lab uses a set of three genes introduced via injection to reset cellular age by approximately 75%, then stop — preventing regression to an embryonic state. The same gene combination used in upcoming human eye trials for blindness has also reversed aging in mouse brains, skin, ears, and multiple sclerosis models. An independent lab using the same technology extended remaining lifespan in elderly mice by 100%.
• •Fasting Raises NAD and Activates Sirtuins: NAD, one of the body's most abundant molecules, declines by roughly 50% by age 50. Sirtuins require NAD to both regulate gene expression and repair broken DNA. Fasting raises NAD levels, reactivating sirtuin function. Sinclair recommends building toward a daily eating window that starts no earlier than early afternoon, targeting a minimum 14-hour overnight fast, with one extended 3-day fast per month to trigger deep cellular autophagy.
• •Polyphenols Accelerate the Sirtuin Pathway: Molecules found exclusively in plants — including resveratrol, quercetin, fisetin, and anthocyanidins — act as accelerator pedals for sirtuins beyond what NAD alone provides. Stressed plants produce higher concentrations: shade-grown matcha, cold-pressed extra virgin olive oil, blueberries, and brussels sprouts (for sulforaphane, which activates the NRF stress-response pathway) are among the highest-value sources. Sinclair has replaced daily alcohol consumption with direct polyphenol supplementation.
• •Accelerators of Aging to Eliminate: DNA breaks are the primary trigger of epigenetic drift. Smoking, CT scans, frequent flying (cosmic ray exposure), ultra-processed foods, excessive alcohol (even one daily drink shows measurable brain gray matter reduction in UK Biobank MRI data), and sustained loud noise exposure all accelerate chromosomal damage. Each break forces sirtuins away from their identity-maintenance role, and incomplete recovery compounds over decades into measurable biological aging.
• •NMN Supplementation Doubles NAD Levels: Taking one gram of NMN (nicotinamide mononucleoside) orally has been shown in human trials to approximately double blood NAD levels. Sinclair has taken NMN daily for over a decade alongside his 86-year-old father. Human clinical trial data now shows NMN supplementation associates with reduced inflammation, improved cholesterol profiles, lower body weight, and epigenome stabilization — consistent with sirtuin reactivation. NR (nicotinamide riboside) is an alternative precursor with a similar mechanism.
• •Reversing Aging Eliminates Disease Simultaneously: Because aging is the underlying driver of Alzheimer's, most cancers, heart disease, and infertility, reversing cellular age removes the conditions those diseases require to develop. In mouse models carrying human Alzheimer's genes, reversing brain age eliminated dementia symptoms without targeting the disease directly. Ovaries of 16-month-old mice (equivalent to a 65-year-old human) produced healthy offspring after epigenetic rejuvenation. Sinclair's lab has also observed majority cancer cell death or shrinkage when tumor cells are epigenetically reset.