Uhh an MRI, can actually see structural damage done in those esp those with clear alz symptoms.
Not to mention I've never seen anything about saying meds stopping alz. Everyone's knows there is no cure.
Not only that for anyone to get alz in there 30's and 40's for crying out loud is BEYOND RARE, not even worth mentioning, and is most likely a genetic predisposition, or mistaken for lyme disease, or even NPH. It's unnecessary to go frightening people. The internet has enough of that already!!