One of the most inspirational pieces I've seen done on the elderly and persistence. Richmond, BC based Olga Kotelko decided to start exercising at the age of 77, now 94 she has won 750 gold medals and broken 26 world records. An amazing feat! Hear her story here as interviewed on Today.
http://www.today.com/health/what-makes-olga-run-lessons-94-year-old-track-star-2D11947816