Manuel "Manny" Aguirre, 80, has been mixing cocktails at Musso and Frank Grill in Los Angeles for more than two decades. He works part time and could retire — but he doesn't want to. Courtesy of Musso and Frank Grill hide caption

itoggle caption Courtesy of Musso and Frank Grill

Pansy Greene, 73, is in the early stages of Alzheimer's. She and her husband, Winston, have been married for 57 years. She says her secret to maintaining a normal life is to stay active and positive. David P. Gilkey/NPR hide caption

itoggle caption David P. Gilkey/NPR

Gilroy Hain's only source of income is the $1,500 a month he receives from Social Security. Ina Jaffe/NPR hide caption

itoggle caption Ina Jaffe/NPR