The HMD (which requires a free registration) contains data tables with age and gender breakdowns for mortality and life expectancy in many countries (largely from the OECD). The site also provides links to related external sites.
A free ICPSR account is required to download data. The account must be created and accessed every 6 months from on-campus or through the proxied link above. Visit this guide for more information.
Provides access to computerized social science data collected by the Inter-University Consortium for Political and Social Research, a membership-based, not-for-profit organization serving member colleges and universities in the United States and abroad.
SAMHDA, which is hosted by the ICPSR, provides "ready access to substance abuse and mental health research data." The archive contains data for survey series such as the National Survey on Drug Use and Health and Monitoring the Future: A Continuing Study of the Lifestyles And Values Of Youth.