Well, one of my couples were infertile and I tried the baby boost too late when they were in their late 40s.

The man died and the widow immediately got a marriage propsal at 63 from a 64 year old. I wonder if you only get marriage proposals if you don't have kids when the mate dies.

I turned it down and fortunately a little girl came to the door looking for a family so she adopted her. I was sweating a little and thinking I might loose that family and they will die out. But one thing I noticed is that the dead husband was removed from the family tree.