Etymology
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senescence (n.)

"condition of growing old, process of decaying by time," 1690s; see senescent + -ence. Related: Scenescency (1660s in the same sense).

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Definitions of senescence

senescence (n.)
the organic process of growing older and showing the effects of increasing age;
Synonyms: aging / ageing
senescence (n.)
the property characteristic of old age;
Synonyms: agedness
From wordnet.princeton.edu