dotage

Decline in judgment and other cognitive functions, associated with aging; senility.

"More care!" said the old man in a shrill voice, […] there were in his face marks of deep and anxious thought which convinced me that he could not be, as I had been at first inclined to suppose, in a state of dotage or imbecility.

Fondness or attentiveness, especially to an excessive degree.

Claudio And ſhe is exceeding wiſe. Prince In euery thing but in louing Benedicke. […] I would ſhee had beſtowed this dotage on mee, […]

Foolish utterance(s); drivel.

No leſs are they out of the way in Philoſophy, peſtring their heads with the ſapleſs dotages of old Paris and Salamanca.