Hi I am new I hope you don't mind if I add my two cents here.
Everything has a spirit and a soul. Especially the elementals. I would think that a handicapped person could become a mage unless they were mentally handicapped then they could become more of a witch than a mage because a mage has more ceremonial difficult intricate spells that need to be learned where with a witch you can make your own spells and cast them and it is mostly the will power. The learning is less book and more heart.