TY - JOUR A1 - Cutler, D.M. A1 - Poterba, J.M. A1 - Sheiner, L.M. A1 - Summers, L.H. T1 - An aging society: opportunity or challenge Y1 - 1990 JF - Brooking Papers on Economic Activity VL - 1990 IS - 1 SP - 1 EP - -73 ER -