(a) = middle age, n. 1; †(b) the life of the middle classes (obsolete).

The period of life between young adulthood and old age, now usually regarded as between about forty-five and sixty. Also figurative.

= middle age, n. 1.

= middle age, n. 1; cf. mid eld n. at mid, adj. n.1adv.2 compounds 2a(b).

the years in the middle of a person's life; middle age.

spec. The middle period of a person's life, when his or her powers are at the full; one's prime. Frequently with of.

Sometimes euphemistically: Which it is not polite or necessary further to define. a certain age: an age when one is no longer young, but which…

The middle part of a person's life; middle age.

The middle period of a person's life. Now rare.