Fertility Biomarkers Predict Differential Survival in a Long-Term Follow-Up Study of Male Fertility: Capturing and Treating Heterogeneity • Ronny Westerman, University of Marburg ; Katharina Pyka, University of Marburg ; Martina Schmidt-Stolte, University of Marburg ; Markus Thiede, University of Marburg ; Sabine Groos, University of Marburg ; Walter Krause, University of Marburg

Are Sex Hormones Biomarkers of Sexual Function in Later Life? • Stacy T. Lindau, University of Chicago ; Natalia S. Gavrilova, University of Chicago

Is There a Trade-Off between Fertility and Longevity? A Comparative Study of Three Large Historical Demographic Databases Accounting for Mortality Selection • Alain Gagnon, University of Western Ontario ; Ken R. Smith, University of Utah ; Marc Tremblay, Université du Québec à Chicoutimi ; Hélène Vézina, Université du Québec à Chicoutimi ; Paul-Phillipe Paré, University of Western Ontario ; Bertrand Desjardins, Université de Montréal

Is Sex Imbalance in Early Age Mortality Driven by Prebirth Environmental Factors, Child Biology, or Parental Preferences? Evidence from Male-Female Twin Pairs • Roland Pongou, Brown University