Table 2.
Participants’ (N = 104) demographic and cognitive characteristics
| Decade | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
|---|---|---|---|---|---|---|---|
| n | 10 | 15 | 18 | 19 | 18 | 13 | 11 |
| Age range; M (sd) | 23–27; 25.8 (1.3) | 28–38; 33.5 (3.4) | 39–47; 43.1 (2.6) | 48–57; 52.8 (3.1) | 59–68; 64.1 (2.6) | 68–77; 71.7 (2.8) | 79–88; 81.8 (3.1) |
| Female n (%) | 5 (50) | 9 (60) | 8 (44) | 9 (47) | 7 (39) | 7 (54) | 7 (63) |
| Education n (%) | |||||||
| None | 1 (5) | 1 (5) | 2 (15) | 1 (9) | |||
| GCSE | 1 (10) | 2 (13) | 2 (12) | 1 (5) | 2 (12) | 3 (23) | 1 (9) |
| A-level | 1 (5) | 4 (21) | 1 (5) | 1 (9) | |||
| University degree | 9 (90) | 13 (87) | 14 (78) | 13 (69) | 15 (83) | 8 (62) | 8 (73) |
| Fluid intelligence M (sd) | 38.9 (2.8) | 38.8 (5.4) | 34.4 (4.3) | 32.8 (4.5) | 32.7 (5.7) | 26.9 (5.5) | 28.1 (5.5) |
None = no formal education; GCSE = General Certificate of Secondary Education (taken at age 16 years, after 9 years of formal education) and is equivalent to a US high-school diploma; A-level = General Certificate of Education Advanced Level is taken at age 18 years after 11 years of formal education and is equivalent to the International Baccalaureate; fluid intelligence = total score on the Cattell Culture Fair test of intelligence (Cattell, 1971).