Table 1. Age at Assessment and Descriptive Statistics for Measures Entered Into the Bivariate Dual Change Score Model.

Measure	Midlife (aged 25 – 64)			Old Age (aged 65 + years)
	n	M	SD	n	M	SD
Perceived Control
T1	2,364	50.02	9.94	1,238	49.96	10.13
T2	1,933	50.75	9.86	915	49.28	10.31
T3	1,801	51.31	9.27	588	49.40	10.15
T4	1,451	51.98	9.11	236	49.61	9.94
Health
T1	2,364	52.89	8.68	1,238	44.47	10.04
T2	1,936	52.47	8.88	922	44.34	10.32
T3	1,835	50.99	9.42	720	43.22	10.48
T4	1,450	47.51	11.20	237	42.24	10.31
Age
T1	2,364	43.93	12.45	1,238	73.29	6.44
T2	1,936	47.22	12.39	922	75.63	6.01
T3	1,835	51.81	12.24	720	79.90	5.55
T4	1,484	58.26	11.91	300	85.26	4.38
Emotional Support (1-5)
T1	2,364	4.01	0.74	1,238	4.12	0.76
Physical Activity (1-4)
T1	2.364	2.80	0.77	1,238	2.45	0.88
Memory (0-6)
T1	2,364	5.45	1.28	1,238	4.93	1.92
Depressive Symptoms (1-3)
T1	2,353	1.44	0.37	1,224	1.42	0.36
Education (0-17)
T1	2,364	12.23	3.05	1,238	10.02	3.75
Gender (% Women)
T1	2,364	59%		1,238	69%

Note. Perceived control and Health standardized to the T metric with the Time 1 (T1) Americans' Changing Lives Study sample (N = 3,602) as the reference (M = 50, SD = 10). Baseline assessment or T1 in 1986, Time 2 (T2) in 1989, Time 3 (T3) in 1994, and Time 4 (T4) in 2001-2002.