(The Last Unicorn is actually by Rankin Bass, the same company that brought us the Thundercats, and it's based on a book by Peter S. Beagle of the same name).
My theory is that the Goddesses age (they *have* to, since we've seen Belldandy as a small child), but once they reach, say, the goddess equivalent of 25 or 30, they stop.
As for their immortality, isn't that explained by the doublet system?
14-Jan-2005