Blue herons got 100% of my koi while I was away on vacation a couple of years ago ... since then the pond has been inhabited by 'feeder fish' which have grown fairly well - although no where near the size of the koi.
They react a lot like the koi at feeding time.

Gary ... I think you've got to find s 'younger' keyboard player/vocalist and take him/her under your wing to pick up the gigs you are dropping ... Your grandson is a little too young, but how about you son or daughter?

If I weren't so far away I would try to help you out ... of course your clients would have to realize that when you "can't get the best, you have to settle for less" ...