Demographics of age groups (young, middle, and old) for neural and cognitive measures
| Age group | Sample size (N) | Mean age (years) | SD age | |
|---|---|---|---|---|
| Gray matter | Young | 217 | 32.82 | 6.92 |
| Middle | 217 | 54.56 | 6.25 | |
| Old | 217 | 75.56 | 5.91 | |
| White matter | Young | 215 | 32.87 | 6.89 |
| Middle | 216 | 54.69 | 6.32 | |
| Old | 215 | 75.66 | 5.85 | |
| Cognition | Young | 235 | 33.10 | 7.19 |
| Middle | 236 | 54.86 | 6.37 | |
| Old | 236 | 75.84 | 5.87 |