Niánqīng shí de tā wánshìbùgōng, hòulái jīnglì mónàn cái biàn de chéngshú.
In his youth he was irreverent and cynical; it was hardship that later made him mature.
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玩世不恭 describes someone who treats life and social norms as not worth taking seriously. It can be negative (irresponsible) or stylistically appealing in fiction for a roguish anti-hero type. Compare with 愤世嫉俗 (bitter, resentful cynicism).