Ah! Judas Priest. Yes!
Absolutely. If you can still play and you can still sing, by all means, do what you love to do. That said, I went to see B.B. King for the last time in Charlotte a couple years before he died, and having seem him decades earlier, it was a bit sad to see him sitting on a chair... the (seemingly) first half hour of the show was dedicated to introducing his band... but then he went into Downhearted, and his play was as sharp as ever.