Why do we stop listening to new music as we get older?

JSB wrote enough music to keep one busy for at least a lifetime.

Even only one of his works can keep somebody busy for a long time.

My major period of exploration was from about age 25 through 45, focused on Jazz.

Since then, the new music I've enjoyed has pretty much all been Americana/New grass.  

However, I seem to be finding less and less new music enjoyable. I once regarded music listening as an immense "playground" and it's disappointing to discover there are real limits to my capacity for music appreciation. However, I can't force myself to like what doesn't appeal to me. 

There's also the question of what is meant by "new". At this point, it's quite challenging to create music that sounds significantly unlike anything that's come before. 

After 1980 huh, sorry Madonna, Celine, Maria, Whitney and others, you better start treating your voices.

It I haven't heard it before, it's new music to me - regardless of when it was recorded.

Well for me "new" music sucks, It's all Auto tune.  Mostly computers playing the instruments.  Really last newer band for me was Audioslave.  I mostly stick to 60's 70's 80's 90's