middle age noun
ADJ. early | late a woman of late middle age | comfortable He settled into comfortable middle age.
VERB + MIDDLE AGE approach a bald man approaching middle age | reach
PREP. in ~ He mellowed in middle age.
PHRASES well into middle age She had her first child well into middle age.
You can also check other dicts: middle age (English, 中文解释 ), wordnet sense, Collins Definition