Adolescence lasts into your 30s, and other surprises about the brain
- Posted on December 9, 2025
- By Washington Post
- 2 Views
Adolescence lasts into your 30s, and other surprises about the brain

We may consider 18- or 21-year-olds adults, but new research suggests the brain isn’t fully developed or stable until our late 20s or even early 30s.