Archive · 23 Dec 2025
Brain Ages in Five Distinct Stages
Scientists have found that our brains go through five different stages as we grow older.
The first stage is from birth to age 9, where the brain grows and gets rid of extra connections.
From 9 to 32, the brain becomes more efficient and better at communicating.
From 32 to 66, the brain is stable and regions become more separate.
Between 66 and 83, the brain starts to age, and connections begin to weaken.
After 83, the brain relies more on individual regions.
This research helps us understand why certain brain conditions happen at different ages.
The brain goes through five distinct stages: childhood (birth-9), adolescence (9-32), adulthood (32-66), early aging (66-83), and late aging (beyond 83).
Researchers analyzed 4,000 brain scans to map changes in white matter connections over time.
The adolescent phase lasts until age 32, and the adult phase is a period of stability until early aging begins at 66.
During early aging, brain regions form stronger groups but are less connected to other modules, and white matter starts to degrade.
Beyond 83, brain connections deteriorate, and the brain relies more on individual regions with highly used pathways.
- Who
- Researchers from the University of Cambridge and other institutions
- What
- Identified five distinct stages of brain aging
- When
- Study published in November in Nature Communications
- Where
- U.S. and U.K.
- Why
- To understand brain-related conditions and healthy aging
- Study Source
- Nature Communications
- Number of Brain Scans
- 4,000
- Key Age Milestones
- 9, 32, 66, 83
- Childhood Phase
- Birth to 9 years
- Adolescent Phase
- 9 to 32 years
- Adult Phase
- 32 to 66 years
- Early Aging Phase
- 66 to 83 years
- Late Aging Phase
- Beyond 83 years