We use the severe and short-lived shock created by the 1994 Rwanda genocide to identify key ages in the accumulation of human capital. Using the post-genocide Demographic and Health Survey for Rwanda and neighboring countries we explore how exposure to the genocide affected women’s health as measured by their adult height. We show that the effect of the shock decreases with age as younger girls were affected more severely. However, the effect is not zero for older ages. We find large negative impacts even for those who were between 13 and 18 at the time of the genocide. These results are robust to a large set of possible confounding factors including the possible nonrandom survival rates of the genocide. Our findings suggest that the sensitive periods for this aspect of human capital accumulation go well beyond early childhood.