Daphna Gans1, Merril Silverstein2, Ariela Lowenstein3. 1. Rand Corporation, 1776 Main Street, PO Box 2138, Santa Monica, CA 90407 USA. 2. Gerontology and Sociology, School of Gerontology, University of Southern California, 3715 McClintock Avenue, Los Angeles, CA 90089 USA. 3. Center for Research and Study of Aging, University of Haifa, Mount Carmel, Haifa 31950 Israel.