The noun dotage describes the mental decline that many elderly people eventually experience. Those in their dotage sometimes act silly or forgetful.

The first syllable in dotage rhymes with go: “DOE-tage.” The verb dote means “to be silly” and also “to be infatuated,” both of which can at times describe those in their dotage (including a renewed interest in romance that many may not have experienced since they were giddy teenagers, in love for the first time).

Definitions of dotage
  1. noun

    mental infirmity as a consequence of old age; sometimes shown by foolish infatuations

    second childhood, senility
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    type of:

    age, eld, geezerhood, old age, years

    a late time of life

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