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MiinU
Since: Jun, 2011
I've seen this in Robotboy with the Evil Knockoff of Tommy, Evil 17, who looks the same as Tommy, yet has stubble like someone in his 40s. Image◊
I also saw it in The Strange Chores, an Australian cartoon, where Van Helsing's descendant de-aged himself to teenage age, yet looked like an old man even when young - image.
Do we have such a trope for this?