Language change among immortals

This is a question that has been bothering me for a while. I may have
asked the conlangs comm on LJ about it a while ago, but either I
didn't get an answer or I didn't understand/forgot it.

How would a population being immortal, or at least very long-lived,
affect the way that their language evolves?

Tolkien's languages are the only conlangs I can think of at the moment
that are spoken by a very long-lived race, but I haven't studied them
at all. I should probably do that sometime. =)

--
kutsuwamushi
(Watch reply-to, gmail user!)

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