Cross-national comparisons of data from developed countries offer useful insights into the retirement process and policy. Here we summarize findings for older persons age 50-70 using new microdata files collected by the Japanese Study of Aging and Retirement (JSTAR) project, and we compare these with results in the U.S. Health and Retirement Study (HRS). We examine the relative importance of health, wealth, family, and other factors in work and retirement at older ages cross-nationally. Though both countries have relatively high employment at older ages, the Japanese have longer life expectancy, higher levels of financial wealth, and a lower public pension eligibility age. Our analysis, the first to compare these two rich data sources, sugg...