You posted this in the thread for VV A new home, so im assuming you have the first one, and in that one there is no age limit for women to have babies, thats a new feature for the second one, VV the lost chilren, so you can make them have babies up will you think they are too old, and the 5 year old, im assuming you mean the golden child, and yes he stays 5 forever, he never grows up, so he will never have children.
If you posted in the wrong section and your talking about VV the lost children, then your villagers are too old, but if your child is a female, she can still breed with a male when she turns 19, any male, the age limit only applies to the woman (shame) LOL, hope this helps you.