Sad, sigh. A lot of these kids know nothing - and care less - about anything that happened not just before they were born, but, before they came to human or, 'musical awareness'. To them, Paul McCartney is as unknowable, as distant in time & space and as unfathomable as someone from the age and era of the Pharaohs....
Basically, most of these kids have no sense whatsoever of historical perspective, nor have they the knowledge to place things in some sort of pattern, or perspective. If it didn't happen while they could experience it or remember it, then, it didn't happen at all.
Re Sir Paul himself, agreed, much of his solo stuff leaves a lot to be desired, but his some of his earlier material with The Beatles is simply classic. Not to mention timeless.
Around ten years ago, I had a class of Modern European History students (not first years) in my country's best university to whom I was teaching an elective course in Modern Russian and Central & Eastern European History (so, one assumes an interest in the subject matter and a slight intellectual curiosity concerning the topic) confess that they had never, ever heard of Lech Walesa. I was stunned. And shocked. The assumptions I had made concerning 'assumed' knowledge had to be radically revised.......