I'm going to have to look that up! Thanks.
I would bet that the immortal elves are probably able to reproduce despite their age... on account of being ageless! But that mortal elves go through something like menopause. Maybe, just like most mammals, the males can continue to inseminate well into their later years (bearclaw!)- but the females can't reproduce as easily the older they get. It sort of make sense.. considering they got their mortality from wolves. If their bodies start to break down naturally, it would probably happen in the same way that it would for wolves. And female wolves do get too old to breed.