I haven't figured out how to get into the breeder's contest yet, but I found out from a cheat website that you have to get into the breeder's contest and then tap "grow taller." I hope you find out how to get your pony to grow older while in the meantime I'm working at it as well.
i finally got mine to grow up after being in the breeders contest you need to know tricks and know how to groom to enter and have the right things like a comb and soap
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