A lover, especially the illicit partner of a married woman.
Middle English: from Old French par amour ‘by love’; in English the phrase was written from an early date as one word and came to be treated as a noun.
“She looked everywhere but her beloved paramour had left and she never saw him again.”
The last stage of life; old age.
Senectitude comes from the Medieval Latin noun senectitūdō meaning “old age,” which in turn comes from Classical Latin senectūs, a derivative of the noun senex meaning “old man.” Senectitude entered English in the late 1700s, more precisely, in 1796 in Jonathan Swift’s Gulliver’s Travels