Old and New Jazz. As Branford said, there are only so many notes. After awhile it will repeat itself to some degree. Nothing new under the sun type thingy.
Several years ago I was in San Antonio at a Best Buy store. They had a fantastic CD section, and everytime I was in town I went there. Once I bought a Multi-Disc box set by Ellington. At the checkout counter, the girl scanned it and said, "wow, that's expensive". I said, "yes it is". She looked at the CD for a moment and said, "He really must have been famous". I smiled and said, "yes he was".
Every musical genre has a beginning, reaches an apex which is followed by a slow decline. The genres carry on, but a lot of people get off the train when the music stops speaking to them. They are replaced by the young, who think the current stuff is just awesome. Just as we did in the 50s /60s. Just imagine what the swing fans thought of Trane.
There are no more people like Muddy Waters, John Lee Hooker, Elvis, The Stones, Mozart, Bach, Goodman, Ellington, Mingus, Mahalia Jackson etc...... you get the drift. I just hope you enjoyed the ride when your prime coincided with the music's prime. That's all there is. Of course there is always a little overlap.
We can all be thankful for the recorded media we have.
And if THEY don't know who The Duke Is, then I don't know who Paterson is! So there!
Cheers