despite he is at a very young age , but he is behaving just like a adult.
个人感觉用现在进行时比较恰当
Despite his youth (adolescence), he acts (behaves) like an adult.
Despite his youth, his action (behavior) is like an adult.
He behaves like an adult despite his young age.
Though he is very young,yet,he behaves like an adult.
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