Definition of "mid-fifties" [mid-fifties]

• The time of life between 50 and 60. (noun)

Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)

• "I was immediately struck by the differences between stars then and now, reminded of the famed pictures taken by photographer Eve Arnold during that pivotal time in the mid-fifties, some private moments like Marilyn snapped from the rear in an airport ladies' room in Chicago, her skirt innocently hiked up, panties in view."
• "And the number of magazines devoted to SF has tailed downward since the mid-fifties."
• "And of course -- like Taylor -- I'm a writer; I have a double respect for the man who both endured the rigors of fighting fire until his mid-fifties and wrote a riveting book about his life on the fireline."