Pass the night (somewhere).
Early 17th century: from Latin pernoctat- ‘spent the night’, from the verb pernoctare, from per- ‘through’ + nox, noct- ‘night’.
“She was the first ever woman member to pernoctate at the college.”
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