If you're in your twenties or thirties and don't have kids, a buzz of unspoken questions about your childbearing decisions might have hovered around your Thanksgiving table last weekend. Next time the would-be grandparents in your family start wondering about your plans, it will be helpful to have some ammo about what scientists are saying about what the "best age" is to have a baby.
Their answer depends, in part, on what you mean by "best.