I know I have probably breached the age limit rules but I just watched Thomas Sangster in a YouTube short called 'Orbit Ever After' in which he plays the son of an eccentric family living in a decrepit piece of space junk orbiting the Earth. It was both funny and sad and very well made for a short film. Go watch.   

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Thomas Sangster is one of the few boy actors to have kept his relatively young looks into his late teens and even twenties.