The ’60s came to an end, and so, after the seventh and final season, will “Mad Men.” And that makes Season 6, which begins on Sunday night on AMC, feel a little like an office retirement party.

Life isn’t over, by any means — new paths can form — but character and destiny are set. Death, meanwhile, is creeping up.

Don Draper (Jon Hamm) hasn’t changed his ways. The last sight viewers had of him at the end of Season 5 was much like the very first one: the ad man was drinking alone in a smoky bar. He was divorced from the first wife and married to a new one, but his modus operandi was intact. When a pretty woman sidled up to ask if he was unaccompanied, the episode closed on Don’s silent, wolfish stare.

As he put it himself on a different occasion: “What is happiness? It’s a moment before you need more happiness.”