dotage

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[edit] English

From Middle English from doten to dote

dotage (plural dotages)

Decline in judgment and other cognitive functions, associated with aging; senility.
- 1841, Charles Dickens, The Old Curiosity Shop, ch. 1,
  
  "More care!" said the old man. . . . 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.
- 1598, William Shakespeare, Much Ado About Nothing, act 2, sc. 3,
  
  CLAUDIO: And she is exceeding wise.
  
  DON PEDRO: In every thing but in loving Benedick. . . . I would she had bestowed this dotage on me.

senility