Jay Leno has been by wife Mavis Leno's side as she relies on him amid her dementia battle. "That's part of it because now she really needs me, and I like that. And I can tell that she appreciates it," Jay, 75, said during an interview that aired on the Thursday, November 20, episode of Today. "And the idea that you get married and you take these vows, nobody ever thinks they'll be called upon to act on them, you know? You know that part for better or worse. But even the 'worse' is not that bad.