I broke 3 of my mommys (2 on purpose before I read the forum) and 1 by accident trying to get a male to study medicine. I tried the suggestion of putting the males on the nursing mothers...unfortnately that didn't work for me. My 2 females just returned to their original ages before I granted youth, and one has finally delivered (age 62), the other now only has 5 more minutes (age 60)