How young? Just because a band isn't played on the radio doesn't mean a thing. Little Steven has said that if the Rolling Stones came along today, they wouldn't get played.
There is no new rock and roll on the radio. Did bands stop playing rock and roll after the deaths of Big Bopper, Buddy Holly, Ritchie Valens, Eddie Cochran, and the arrest of Chuck Berry, the induction of Elvis Presley, the shaming of Jerry Lee Lewis, and the religious professsion of Little Richard? Nothing between that era and the Beatles?
There was plenty of rock and roll being made. Radio switched to novelty songs and poster boy pop stars. Even with that payola scandals ran through the early 1960s. Just because radio didn't play it and magazines didn't cover feature it, doesn't mean it didn't happen. Same as now.
The only time I buy a CD anymore is when the artist dies. Kind of a commemorative purchase. Aside from that, the only musical recordings I listen to is what happens to be played as bumpers on the radio or when that ******* drives by every day at 5:45 on the way home from his warehouse job. But, I hear plenty of music and it is live. Sometimes concerts, but usually just rehearsals.