Here is my short list of long-lived Hollywood marriages. That is, persons who have just one marriage or at least a long marriage. Execptions of course when a spouse dies.
* Bud Abbott
* Lou Costello
* Patrick Swayze
* Lucille Ball (she tried)
* Bob Barker (game show host)
* Stan Laurel
* Audrey Meadows
* Ronald Reagan
But as you see, I don't have any single marriages.