I would imagine as well that the genie has no choice but to grant the wish? Also as for the age of my witch, would it be plausible for my witch to have maintained her physical and mental youth, but have been born in the early 1900's?

As well [@QTmutie], is your character complete? It helps in character creation to see what would fit best with the others around it, you see. If he is, he could be a good jumping off point for our characters.