All our favorite bands from the 60s, 70s, and many of them from the 80s will be too old to tour anymore.
Friend of mine and I were having a discussion about this yesterday.
Iron Maiden, Judas Priest, AC/DC, Motorhead, VH, Slayer, The Stones, what's left of The Who......
All the great rock bands who were the first ones to play arenas and stadiums in the first 2 1/2 decades of what we call the modern touring industry......they will all be over 70 years old.....if you are some lame pussy like Rod Stewart, you can be the Tony Bennett of the Rock Generation and keep going until you are 80 or 85....but most rock bands, and seriously most metal bands, will hang it up before they hit 70....
They will only be around in our memories, and on our DVD players....
So go see them while you still can...