title: One simple question can change the world.
authors.affiliation: Wills Eye Institute, Philadelphia, Pennsylvania 19107, USA. gspaeth@willseye.org
authors.forename: George L
authors.initials: GL
authors.lastname: Spaeth
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D000533:Altruism; D006801:Humans; D010549:Personal Satisfaction; D011788:Quality of Life; D012179:Retirement; D014481:United States