I'm pretty sure I'm on the verge of setting a record for oldest Sim to become a father.
I'm playing the Bunch family right now. We're in week 8, so pretty far along. Judy passed a few weeks ago, Jack is still kicking - he's even been on a couple dates. He was standing outside the hospital talking to Holly Alto (she's a fairy and has sixty-something days left until elder) and he popped a wish to be in a relationship with her. I thought "sure Jack, you can have a trophy girlfriend." Then he popped a wish to marry her. "Okay, why not?" was my response. Newly wedded bliss, many gifts - mostly from Jack's kids - and a few days pass ... and then Jack and Holly pop wishes to have a baby with each other.
Jack Bunch, at 105 days old, wants a nooboo.
If he manages avoid Grim until after the birth, Jack will be about 108 when his youngest child is born.