Presented at The Living to 100 and Beyond Symposium

published review. Permission is also granted to make limited numbers of copies of items in this monograph for personal, internal, classroom or other instructional use, on condition that the foregoing copyright notice is used so as to give reasonable notice of the Society's copyright. This consent for free limited copying without prior consent of the Society does not extend to making copies for general distribution, for advertising or promotional purposes, for inclusion in new collective works or for resale. 2 The changing age structure in industrialized countries is raising concern among policy-makers over the funding of social security programs, especially pensions and health care. The aging of the population, that is, the increased percentage of the elderly, appears at first glance to be the determining factor in the growth of costs. In Canada the most recent population forecasts suggest that the proportion of people aged 65 and over will reach 25.2 percent by 2051. In addition to these changes in the population age structure, governments are worried about increased public spending on health care. For example, in the United States the cost of the two major health-care plans, Medicare an