middle age

US /ˌmɪd.l̩ ˈeɪdʒ/
UK /ˌmɪd.l̩ ˈeɪdʒ/
"middle age" picture
1.

средний возраст

the period of life between youth and old age, usually considered to be between the ages of 45 and 65

:
He's in his middle age, but still very active.
Он в среднем возрасте, но все еще очень активен.
Many people experience a 'midlife crisis' during middle age.
Многие люди переживают 'кризис среднего возраста' в среднем возрасте.