Yeah, they're worth it...

Childless and Happy:

"Whatever else raising children may be, it's also an expensive and time consuming pain in the ass that sharply limits your flexibility to do a variety of things for a large number of years. One can easily imagine the joys of parenthood being roughly offset by the burdens. But later in life, having a solid relationship with grownup kids and their children seems low-cost and hard-to-replace. Loneliness is very hard on people. To acknowledge that reality isn't to say we need to get all freaked out if the norm moves from 2-3 kids per family to 1-2 kids per family."