English Translation
Though he is young, he never wastes time.
Shouldn’t this rather be “Aunque es joven”? We know for a fact that he’s young, so there’s nothing hypothetical about it, and thus no need for the subjunctive.
Either is valid, but sea sounds more natural to me (even if it’s a fact that he is young). Él feels redundant.
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Perhaps the English translation should rather be “Though he may be young”, or “Young as he may be”. 
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