'mid-thirties' definitions:

Definition of 'mid-thirties'

(from WordNet)
noun
The time of life between 30 and 40 [syn: thirties, mid- thirties, thirty-something]

Definition of 'mid-thirties'

From: GCIDE
  • mid-thirties \mid-thirties\ n. the time of life between 30 and 40.
  • Syn: thirties, thirty-something. [WordNet 1.5]