What's up with this?

All of a sudden (age 47), I've gotten turned on to jazz - put it on once in the car and can't get enough of it. Smooth jazz, old standards, all kinds of jazz and a lot of big band music too. I was a rock and roll fanatic for over 40 years, and I can't understand why all of a sudden my music taste changed suddenly. I'm really addicted to this stuff I couldn't stand a year ago. Is there some biological change that happens at certain ages? Am I going to start changing my radio stations to r&b 20 years from now?

SJS (sudden jazz syndrome). It will persist until you lose your hearing or it progresses into PCD (permanent classical disorder).

Seriously though, this is a monumental step in your life. Whatever the music, let your ears enjoy themselves as they are a precious gift not to be taken for granted.

your just mellowing out . . .as you age. . .

Ya mean Rap isn't doin' it for ya anymore?
Good, me either!
Have you enjoy Diana Krall?
How about some orchestral jazz, Claus Ogerman's 'Gate of Dreams'; it's old but sounds younger than Spring!
I recommend the on-line music program Rapsody for like $10 a month!
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Congratulations! You are now reaching the summit of musical taste. All you need to do is add classical to your musical repertoire and you will be at the top. I have enjoyed both for 30 years, I have a large music collection which has given me unfailing pleasure and I wish the same for you too.

From a musical standpoint, Rock, Jazz and Swing (like big band music) all came from the same place. Changes in musical taste aren't uncommon at all, I used to listen to the newer rock, and now I'm a classic rock fanatic. I also have my own share of jazz, big band, classical and even opera music.

your musical taste is becoming more diverse. i'm a die hard metalhead and got turned on to jazz and blues when i was 18, and still listen to it all