Seeing as how the villagers are ridiculously easy to kill, I would not apply "immortal" to them.

You could just go to the Temple of Avo and Chapel of Skorm to get the age reduction if it bothers you so much.

Not anymore. You can tell who's a mod, along with what they mods, by the "moderator" title below their username.

It's Knothole Glade.

That happens. You can get up to ten years taken off, but it doesn't necessarily mean that you'll get ten. I recommend saving before you donate; if you don't like the result, just reload and try again.

Hair changing back to black depends on your alignment. Getting the age reduction can get you back from gray or white to whichever color it was in your youth, which depends on your alignment (evil has receding hairline with horns, neutral is black, and good is blond).

Also, keep in mind that you get alignment points for each sacrifice and donation.

J ton, that question was asked - and answered - back in September, when I was, in fact, not a mod anymore.