title: Living longer, contributing longer.
authors.affiliation: International Longevity Center (US), Mount Sinai Medical Center, New York, NY, USA.
authors.forename: R N
authors.initials: RN
authors.lastname: Butler
mesh_terms: D000368:Aged; D004526:Efficiency; D006801:Humans; D008136:Longevity; D014481:United States / Q000453:epidemiology