senility, second childhood, senescence, senilism, aging, acrogeria, degenerescence, Alzheimer's disease, degeneration, cognitive dysfunction syndrome, more...

senile, demented, addled, imbecilic, moronic, idiotic, stupid, doltish, fatuous, more...

premature, mere, paralytic, long, last, childish, own, senile, licentious, greater, late

beginning to dote