Mozart made it 'til 35 -- not plague, I think it was some kind of fever.
I'm not fussed about him, to be honest. He wrote terrible horn parts that are a complete bore to play (his Horn Concerto no.3 notwithstanding, but one doesn't get to play horn concertos every day). That's not enough to wish him death, of course, but I personally would say that by his late 20s he'd already found his niche or `groove' and was churning out scores with nothing really new. Debussy, on the other hand, kept up the innovation right until his death. He lived much longer.
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