Procellous (adj) (rare)
Early 17th century; earliest use found in Thomas Goffe (?1591–1629), playwright and Church of England clergyman. From French † procelleux from classical Latin procellōsus stormy from procella + -ōsus.
“She landed on a procellous night and we never found where she came from.”
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