When they are able to have babies i think they are adult. Mine is four and able to use honey (love potion) so i guess that means he can have kids. It should say in the instructional booklet the ages when they are child, teen, and adult i think.
good for you!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!