Listen, I am in my 60's, but the main problem I have with new music, is keeping up with all the great new stuff coming out, in several genres, from all over the world.
I there have been quite a few studies done, that show, that most people's musical tastes stop evolving at the age of 30. For most people, their favorite music is the music that was the "soundtrack of their youth", and once they settle into their lives at the age of 30, music no longer servers that purpose.
As long as one avoids the mainstream, has an open mind, an inquisitive attitude, and is not trying to relive their youth, there is so much great music out there.