senectitude

noun
se·​nec·​ti·​tude | \si-ˈnek-tə-ˌtüd, -ˌtyüd\

Definition of senectitude 

: the final stage of the normal life span

First Known Use of senectitude

1796, in the meaning defined above

History and Etymology for senectitude

Medieval Latin senectitudo, alteration of Latin senectus old age, from sen-, senic-, senex old, old man — more at senior

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The first known use of senectitude was in 1796

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