gamerprinter
Mapper/Publisher
Its a 9th level spell, sure that means 17th level, and expensive to cast. If it were that easy, why spend experience points to achieve 10 levels of a prestige class, just wish it into place... that's too powerful.
I think the real concern is that extending one's life is a far more powerful condition than one might be considering. It normally takes all kinds of extreme means to extend one's life. If you were an 18th level Wizard with Wish spell why cast anything else - since wish seems to be able to do anything.
In my experience a Wish can raise at stat score by 1 place (ie: Str 17 to Str 18) or undo a day's worth of adventuring in order to avoid some terrible incident that occurred. I never grant one or more full levels of experience with a wish. And I don't allow one to become ageless with a Wish - that's way too powerful.
YMMV, but really shouldn't.
GP
I think the real concern is that extending one's life is a far more powerful condition than one might be considering. It normally takes all kinds of extreme means to extend one's life. If you were an 18th level Wizard with Wish spell why cast anything else - since wish seems to be able to do anything.
In my experience a Wish can raise at stat score by 1 place (ie: Str 17 to Str 18) or undo a day's worth of adventuring in order to avoid some terrible incident that occurred. I never grant one or more full levels of experience with a wish. And I don't allow one to become ageless with a Wish - that's way too powerful.
YMMV, but really shouldn't.
GP