senility

Noun
  1. Mental infirmity as a consequence of old age;
    Sometimes shown by foolish infatuations (synset 115179150)
    is a type of: age, eld, geezerhood, old age, years - a late time of life
    same as: dotage, second childhood
  2. The state of being senile (synset 104934969)
    is a type of: oldness - the opposite of youngness

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