Irving Kahn, a participant in Nir Barzilai's Longevity Genes Project at Albert Einstein College of Medicine, died in New York in 2015 at age 109, and all four of his siblings became centenarians, including his sister Helen who lived to almost 110 despite smoking for 80 years.
Notes on verification
Multiple independent sources including Wikipedia, Boston Globe, Forward, and CBS News corroborate all elements: Irving Kahn's age and death, four centenarian siblings, Helen Reichert's near-110 death age and long smoking history, and family involvement in longevity genetics research. [cascade flags: wikipedia_dropped_other_sources_exist | tier=unverified indep_score=0.32 clusters=5 claim_tier=notable] [rescored 2026-09-15: curated origin-host map (PR #65); unclassified hosts no longer scored as aggregators]
Sources
- Is There a Cure for Aging? (seed:health_and_medicine)
- https://www.bostonglobe.com/metro/obituaries/2015/02/27/irving-kahn-wall-street-oldest-stockbroker-dies/Mn5siNOGXGtjvelN4hXfHK/story.html (corroboration)
- https://forward.com/culture/215608/irving-kahn-oldest-money-manager-dies-at-109/ (corroboration)
- https://www.cbsnews.com/news/worlds-oldest-stockbroker-trading-strong-at-105/ (corroboration)
- https://www.timesofisrael.com/only-as-old-as-your-genes-ashkenazi-super-agers-could-hold-key-to-long-life/ (corroboration)
- https://gerontology.fandom.com/wiki/Helen_Reichert (corroboration)