In my professional life, I went through a number of "titles". I never took them seriously or used them outside that context. But the one "title" that really threw me a loop was a young boy one day calling me "Mister"!
I thought I was a boy too!
(Half a century plus later, my heart and soul still think I'm that little boy!)
As to restaurants, my lifestyle and environment and friends require that I do go to places that are clearly not aimed at my generation. It doesn't bother me too much. But I can't stand noise. Not age related; I never could.
Fortunately, it's the oldies here in China who love the noise. No more fun that going to eat and having a shouting competition. So I'm happy to eat with my younger friends.