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As indicated in both "The Night of the Doctor" and "The Day of the Doctor", it is confirmed that regeneration is random, and in "Night" the Doctor is offered "young" as one of the options (although in that case presumably not too young). In "Day of the Moon", Melody Pond is seen to regenerate; it is assumed that she generates into the incarnation known as Mels as seen in "Let's Kill Hitler" who is shown as having been a child at the same time as Amy and Rory (meaning she didn't regenerate as an adult) and grew older with them. In "The Parting of the Ways" the Doctor also indicates how random the process can be, even suggesting that he could regenerate with no head (presumably meaning he'd die as he'd be in a non-viable form). So just as it's possible the Doctor could someday change gender (per "The Doctor's Wife" and "Night of the Doctor"), it's possible a very young-looking incarnation could occur.