Brett, did you check the ages of the toddlers again after you had closed the game by tapping the home button? I also found an impossible number of two-year-olds once, but after closing and restarting the game, some of them appeared to be older. They were all born overnight, but not at the same time. I suppose that the ages were only updated at the moment I closed the game... You could verify this by checking if there are still 30 peeps of the same age in your village