Comment on More Kids, Longer Life?

Jenny Elia Pfeiffer / Corbis Growing a human being inside you for nine months, and then expelling it with a force that can fracture your pelvis can take its toll on the body. (So can, you know, raising it.) According to a branch of evolutionary biology called life-history theory, there should be a tradeoff for all this effort—namely, that having kids should speed up the aging process.