Old mages and Blood Nations

[Quitti]

indeed. And boots of youth cost less if you are using hammer, lasts indefinitely (though if you're on the verge of old age the rejuv will last for the rest of the game). Only way i'd see rejuv worth casting over boots is that you really need to use other feet slot items (earth boots) or if you really really really want to get rid of the old age maluses such as lowered precision.