Green’s Dictionary of Slang

cinquanter n.²

an old man.

1611		Cotgrave Rocard n.p.: a hoarse mouldichaps, an ouer-worne sincaunter, one that can neither whinnie, nor wag the taile.
a.1624		Bp. M. Smith Sermon (1632) 158: This is a very pleasing speech to some old Cinque-Caters [OED].
1675		C. Cotton Burlesque upon Burl. 173: (D.) Take pity, prithee, Upon a poor old Cinque and Quater, Had paid for playing the Creator.