middle age

noun

: the period of life from about 45 to about 64

middle-aged

ˌmi-dᵊl-ˈājd 

adjective

middle-ager

ˌmi-dᵊl-ˈā-jər 

noun

Examples of middle age in a Sentence

as our generation approaches middle age

The patient was in late middle age.

He feared the approach of middle age.

Recent Examples on the Web

Klotho crests in youth before settling in adulthood and dwindling in middle age. — Mark Ellwood, Robb Report, 9 Aug. 2026

The research, published Wednesday in the journal Neurology Open Access, found that people who avoid three vascular risk factors in middle age — high blood pressure, diabetes and smoking — had about 13 more dementia-free years. — Lily Alvino, NBC news, 7 Aug. 2026

People were in middle age at the study’s start, and no one had dementia. — Kathleen Felton, Time, 7 Aug. 2026

But Coresh’s new study of more than 12,400 adults quantified how much the combination of these vascular measures in middle age may have influenced when dementia began to set in. — Kristen Rogers, CNN Money, 5 Aug. 2026

Word History

First Known Use

14th century, in the meaning defined above

Rhymes for middle age

• disengage
• interstage
• macrophage
• multistage
• alienage
• assuage
• backstage
• bocage
• downstage
• engage
• enrage
• leafage

Kids Definition

middle age

noun

: the period of life from about 45 to about 64

middle-aged

ˌmid-ᵊl-ˈājd

adjective

Medical Definition

middle age

noun

mid·​dle age ˌmid-ᵊl-ˈāj 

: the period of life from about 45 to about 64 years of age

middle-aged

ˌmid-ᵊl-ˈājd 

adjective