I've been looking for a little while now, as a means of finding out this sort of thing... Of course, I can understand modding the game files to help you with this, but when it comes to Fable for Xbox (The original fable...), I don't think it's so easy...
Now... I've gone through and done a lot already... Passed the Archaelogist quest, which was probably a bad idea if I think what I do... But I think that the Age reduction from Avo only happens once. I haven't been told yes or no, and I've been wondering if that idea is true or not...
I would much rather get an email. But a message is fine just as well.
If the Age reduction only happens once, I guess I will have to restart the game and completely do the Archaeologist quest once more, and continue from there... But... To think about it all together. For that kind of Eternal Youth glitch... Can you leave the area where your quest has started? Just to go out and get more exp so you can max out your skills? That way, you keep the eternal youth, but you can max out everything...
When you use the money for the Temple, when you hero-save, and then load... Does the money return to you? How much money in total would you have to give as any type of character just to get the age decrease?
This sort of thing isn't answered in any of the Help forums, I've looked through them, and I've been curious for such a long time. I guess for some people, it's common knowledge, to me... Not so much if anyone of you were curious...