Looks like he may not have gone through puberty. That doesn't mean he will live forever, it doesn't even mean he will live longer than average. Other cases with similar outward appearances, such as castrato (https://en.wikipedia.org/wiki/Castrato) who were castrated before puberty in order to maintain a higher-pitched singing voice, don't appear to have had any tremendous life extension. If I recall correctly, these people may have a tendency toward obesity and cardiovascular problems. Andy Milonakis, a "comedian" who had a show on MTV is another example of someone who has the appearance of being prepubescent despite being in his late thirties:
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