hmmm, lets see. Joe Walsh has been playing Rocky Mountain Way since 1972 or something? Oh, and he wrote it (his version of mannish boy) and the concert is Joe playing Joe's songs with young hopefuls and rising stars playing music from an era from before they were born and being young and nervous around a guy who has been on stage for the last... 50 years?
Comparing the two ages is impossible. Joe Walsh never had to get up with Charlie Christian in order to help get his name out there (and besides, the time difference would have been SHORTER!
I've seen some of the folks who you mention and they are very talented and very committed to their music... and yes, their music is different from the music we grew up with... the idea that they are covering Eagles songs is kind of hilarious (on the show) Joe Walsh had precisely as much to do with Best of My Love as I did (which is exactly nothing.)
Walsh's career was completely floundering and failing when he latched on with the Eagles who initially took him on as a side man...
A producer figured out that he could put out a product that would sell dvd's and commercial time and the young artists accepted that they would be fish out of water but, it would be fun and they would get to play with heroes from the past... the former 'big star' probably needed a pay day and the event wouldn't be a stretch for them (same songs over again) and the load would be lightened by bit parts played by youngsters..
About a year ago, I convinced our band to start listening to current music and find some songs that they liked and we'd work them up. The band nearly broke up over it. They HATED modern country music. But, they did start to listen and now, there are a host of songs we do and do happily that are modern songs that are really really good songs and really really fun to play.
One thing I know for sure, a guy either grows or he shrinks... we never can just stay the same...
The world is an amazing place. Go poke a whale."