The longest living wild dinosaur that we know
of was an albatross (a seabird) who lived to be
66 years old. Several other types of large
birds (parrots, vultures, eagles) in captivity can
live for longer, however.
Of the non-bird dinosaurs, I'm pretty sure
we have no idea of how long they could have
lived. I don't think the fossils give us a
clear idea of how long they lived usually, though
they do show signs of aging. Among mammals, larger
body size generally means a longer life, although
there are some mammals that break the rule (humans
live longer than you would think based on their
size, for example). I notice that all of the
really long-lived dinosaurs in today's world are
large birds, so I suspect that the larger size
helps cause longer life in dinosaurs as well.
As you know, there were extinct dinosaurs that
were much, much larger than any living bird. There
are reasons to think that their lifespans might
have more mammal-like lifespans, however, because
they lived more like how today's mammals do than
like today's dinosaurs (which are of course
birds). For example, crocodiles are the closet
living relative of dinosaurs that aren't birds,
and they can live 100-ish years, much shorter
than what you would think if you simply took the
ages of large, long-lived birds and continued the
line of thought.
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