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There have actually been several child Time Lords seen over the history of the show, the most obvious example being in "The Day of the Doctor" where many child Time Lords were seen on Gallifrey on the last day of the Time War, along with the Doctor's guilt about killing the 2.47 billion of them revealed in the same episode. We have also seen flashbacks to a younger Master in "The Sound of Drums" and one could count Susan, the Doctor's granddaughter first seen in "An Unearthly Child" as a child, having an outwards appearance of being in her mid-teens.