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Sep 1, 2016 at 8:30 comment added Falco That depends on the species. If our Elves are a highly adaptive species, with a broad spectrum of traits, a grown Elf would survive in almost any condition, while a baby elf would need to be born in a stable climate with enough food and everything. The parents could also travel around the world for hundreds of years until they find a place where they can successfully bear a child.
Aug 30, 2016 at 9:50 comment added user @Falco As pointed out by Reese and others, that is very much a double-edged sword. You are assuming that the conditions after the ice age is conducive to survival of the same individuals as it were before; I'm guessing that such is a highly unrealistic assumption.
Aug 30, 2016 at 9:27 comment added Falco An evolutionary advantage could be the survival of long periods, where offspring is infeasible. Like a 2000 year ice-age, which only grown up elves can barely survive. Or the opposite: Elven babies need exceptionally perfect conditions for growing up, such perfect conditions which happen on average once every 1000 years - then you need to live more than 2000 years to produce two offspring :-)
Aug 29, 2016 at 6:18 comment added user @Carl Certainly possible, but you still have to keep the issue in mind. OP asked for disadvantages of a long lifespan; I think my answer provides at least some (though it's obviously very hard to provide an exhaustive list or really go into detail about them).
Aug 29, 2016 at 6:18 history edited user CC BY-SA 3.0
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Aug 28, 2016 at 22:14 comment added Carl But the species evolved to live a 5000 year life ( should OP choose ). The surrounding ecosystem has evolved with them and can maintain such a life form.
Aug 28, 2016 at 8:37 history answered user CC BY-SA 3.0