Richard Piña, 69, with customer Augustin Bustos at Rich's Den barbershop in Calumet City, Ill. Piña, who retired from the Chicago police force 12 years ago, works at his shop four or five hours a day.
Beth Rooney for NPR
John David, 73, teaches an exercise class called PACE to seniors at the 92nd Street Y in New York City. The former TV producer says he has finally found his true calling.
Shiho Fukada for NPR