'In Our Prime'? What It Means To Be Middle Aged
"Not so long ago, being middle-aged was associated with being over the hill. But not anymore — nowadays, 60 
is the new 40. In her new book, In Our Prime, Patricia Cohen, a culture reporter for The New York Times (who isn't shy about telling us she's 51), explores the evolution of that oft-maligned, middle period of life."
"Traditionally, people have seen 40 as the entry point to middle age, but perception of the "start date" varies widely depending on job and gender, Cohen says. Men, for example, think middle age starts earlier than women do. And the older people are, the later they say middle age begins."
"I like to say that middle age is something of a 'Never Never Land,'" Cohen tells NPR's Rachel Martin. "Younger people never want to enter it, and older people never want to leave it once they get there."