An estimated 20,000 surgeons in the U.S. are over 70--no more immune than the rest of us from weaker vision, slower hand-eye coordination or forgetfulness. Yet there’s not a clear system for telling a doctor it’s time to retire from surgery. Dr. Mark Katlic, chair of surgery at LifeBridge Health Sinai Hospital, has devised a two-day evaluation to test the physical and mental fitness of surgeons. It's called the Aging Surgeons Program. We also talk with Dr. Herbert Dardik, who resisted the testing but now is a strong proponent.