TY - JOUR A1 - Hultsch, D.F. A1 - Hertzog, C. A1 - Small, B.J. A1 - Dixon, R.A. T1 - Use it or lose it: Engaged lifestyle as a buffer of cognitive decline in aging?Use it or lose it: Engaged lifestyle as a buffer of cognitive decline in aging? Y1 - 1999 DO - 10.1037/0882-7974.14.2.245 VL - 14 IS - 2 ER -