AdvertisementSeries Overview: More Americans Working Past Retirement AgeFebruary 13, 2013Ina JaffefacebookEmailJohn David, 73, chats with one of his students after his exercise class at the 92nd St Y in New York. (Shiho Fukada for NPR)
John David, 73, chats with one of his students after his exercise class at the 92nd St Y in New York. (Shiho Fukada for NPR)