Aging, widowed, depressed, lonely, alcoholic/denial, senile, wealthy fathers and golddiggers.
Refer to my very recent post under Elder Abuse. (I think it belongs under many topics really.) The real problem is that, when you are confronting it and dealing with it as a child care-giver, due to the shear deplorable nature of it, and the outright taboo it should really be, you find yourself alone with it. That's why I am so grateful to have found this supportive website.