|  |  | Gender | |
---|---|---|---|---|
 |  |  | Male | Female |
all twins | n (pair) | Â | 35 | 78 |
 | age |  |  |  |
 |  | (mean ± SD) | 67.4 ± 15.0 | 55.5 ± 17.0 |
 |  | (range) | 22–87 | 21–87 |
elder | n (pair) | Â | 30 | 43 |
subset | age | Â | Â | Â |
 |  | (mean ± SD) | 71.8 ± 9.6 | 68.1 ± 8.6 |
 |  | (range) | 57–87 | 55–87 |