well, i've not yet seen any official evidence, but as it was discussed earlier on the thread, it is most likely that they do stop ageing at a certain age (maybe early mid twenties?)
If you want supporting evidence for this look back at the Ah! My Goddess movie. During the flashbacks with Celestin and Belldandy, we see Belldandy first meet Celestin as a small child then we see her all grown up at her goddess ceremony but Celestin didnt age a day!
so in my opinion this theory is most definitely correct.
06-Feb-2005