I could be wrong, but....
I think if you knock out an audience with outstanding music and presentation, they're not going to care how old you look. They're going to be so caught up with what they're hearing, they won't have time to think about, or even care about, that awful three letter word....age!
Years ago, Mama Leone's restaurant in NYC used to have a mantra: "Give them good food and plenty of it and they'll come back for more." Substitute the word music for food and there's something to think about.
But you'd really have to be a powerhouse player to do that. As for me I don't have the energy or the enthusiasm anymore!
Mark