senectitude
noun
se·nec·ti·tude si-ˈnek-tə-ˌtüd 
-ˌtyüd
: the final stage of the normal life span
Word History
Etymology
Medieval Latin senectitudo, alteration of Latin senectus old age, from sen-, senic-, senex old, old man — more at senior
First Known Use
1796, in the meaning defined above
senectitude
noun
as in senescence
Synonyms & Similar Words
Relevance
- senescence
- decrepitude
- feebleness
- anility
- second childhood
- senility
- caducity
- geezerhood
- infirmity
- dotage