Most of the Beatles fans I see are over the hill liberal hippies (not all).
Whereas The Who still appeal to a wide range of audiences - even teenagers are still getting into them.
It ain't about the quantity, it's the quality.
That's the cool part of music ... different people get into different things. Honestly ... I've never heard of a younger college aged person getting into The Who and quite the contrary to The Beatles.
Just the circles everyone runs in, I guess.