Welcome, @bobbayers to Connect. That's wonderful that you were able to get a liver at that age, I am sure that will give hope to many who wonder if they will be able to. Your transplant center sounds very progressive to do that, I have heard that some have an arbitrary cut-off date based on age which is sort of crazy I think since many people in their 70s are in such good health.
I was about to turn 69 when I had my transplant. My new liver was 34 at the time. It's quite rare that a liver will be re-transplanted but I have heard it is done occasionally. I would hope it would be when I die, it would be a shame for a beautiful liver to go to waste.
JK