Yes, the window of opportunity has closed to see many, is closing fast on many more. I know the music is slightly different, but am taking my mom to see one of the greats soon, Gordon Lightfoot. I can't believe I have this opportunity to see him (he is 79 now).
I don't go to many concerts as I did when I was younger, but sometimes you have to go, knowing the opportunity will probably never come again.
RE: The Eagles...A Timeless Music Treasure on Tour