How old was Cainan when he died?
Cainan lived 910 years, from 3679 BC to 2769 BC.
Cainan died at 910. The chart places his birth at 3679 BC and his death at 2769 BC, on the Ussher chronology it follows. Fourth from Adam in the line of promise. (Gen. 5:9-14)
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A date means more beside its neighbours. The chart puts this answer in place next to everything happening around it — biblical and world history across the same six thousand years.
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Everything on this page has a place on one 45×37″ chart — and once you can see what came before and after it, it stops being a fact and starts being a story you can follow.