"That man is still young."
I don't like how 男の人 is read おとこの じん instead of おとこの ひと when selecting the words.
Can someone explain the ordering of mada and wakai here? Adverb must come before verb?
The predicate is "wakai desu" and the adverb must precede the predicate. ("Desu" is a polite form with a very complicated grammatical history. It could be left out of this sentence with little loss except the level of politeness. Japanese "adjectives" are actually predicates with full verbal grammar.)