The standard life-cycle models of household portfolio choice have difficulty generating a realistic age profile of risky share. These models not only imply a high risky share on average but also a steeply decreasing age profile, whereas the risky share is mildly increasing in the data. We introduce age-dependent labor-market uncertainty into an otherwise standard model. A great uncertainty in the labor market-high unemployment risk, frequent job turnovers, and an unknown career path-prevents young workers from taking too much risk in the financial market. As labor-market uncertainty is resolved over time, workers start taking more risk in their financial portfolios. and marios.karabarbounis@rich.frb.org. We thank the editor and three anonymous referees for extremely valuable advice. We thank Corina Boar and Andrew Owens for outstanding research assistance. For very helpful suggestions we would like to thank our discussants Gianluca Violante and Raman Uppal as well as seminar participants at the NY Area