Search Result for "middle age":
Wordnet 3.0

NOUN (1)

1. the time of life between youth and old age (e.g., between 40 and 60 years of age); 



WordNet (r) 3.0 (2006):

middle age
    n 1: the time of life between youth and old age (e.g., between
         40 and 60 years of age)