'mid-sixties' definitions:

Definition of 'mid-sixties'

(from WordNet)
noun
The time of life between 60 and 70 [syn: sixties, mid- sixties]

Definition of 'mid-sixties'

From: GCIDE
  • mid-sixties \mid-sixties\ n. the time of life between 60 and 70.
  • Syn: sixties. [WordNet 1.5]