I agree with some of what is being said. I think we are getting way too stuck on age. We know that some magic give the wielder a sort of immortality (Rumple) so it follows that it might be possible for Cora to have extended her life as well. Perhaps that was one of the deals she made with Rumple, long long long long long life.
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"He was a lot of things to me" "The only conclusion was love"