I had a builder who had a baby at the age of 69! AND she didn't go "indoors" with anyone. In fact, I monitered her closely so she wouldn't and she ended up in the village center with child anyway. (While I was focused on the bottom right of the village, she walked in from the upper left of the screen carrying a baby!) She died at the ripe old age of 73 (while the game was off), so I know the baby survived.