senectitude

Noun

senectitude (uncountable)

1. old age
   • Three-and-twenty years form a large portion of the short life of man,—one-third as nearly as can be expressed in unbroken numbers, of the entire term fixed by the psalmist, and full one-half, if we strike off the twilight of childhood and immature youth, and of senectitude weary of its toils.1857, Hugh Miller, The Cruise of the Betsey, Or, a Summer Ramble Among the Fossiliferous Deposits of the Hebrides

   Synonyms:

   agedness, elderliness, oldness, age, chair days, codgerhood, eld, fogeydom, geezerdom, golden years