Etymology
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senile (adj.)

1660s, "suited to old age," from French sénile (16c.), from Latin senilis "of old age," from senex (genitive senis) "old, old man," from PIE root *sen- "old." Meaning "weak or infirm from age" is first attested 1848.

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Definitions of senile

senile (adj.)
mentally or physically infirm with age;
Synonyms: doddering / doddery / gaga
From wordnet.princeton.edu