I have a couple of reasons.
1-When I was a teenager old music was Lawrence Welk, The Andrew Sisters, etc. Now it is Elvis, The Beatles, the old blues players, Humble Pie, etc. Thus my definition of old has changed. If you asked a 20 year old they may think the grunge is old music.
I understand what you are saying. That's basically my opinion as well. That being said, it sounds as though the music industry, for tracking purposes, has deemed "old music" to be anything older than 18 months. It's not a preference thing. They have their definition of it for the sake of analyzing data. That's all I was trying to say.
2- If you ask me now I would say that old music is better than today's music. If you asked me when I was 20 I would have said today's music is much better. If you asked someone who loves rap they may say today's music is better.
Thus it is a matter of opinion and nothing else, i.e. what is old music and what is better music.
I completely agree. Although, I frequently see people try to "prove" the music they like is better. For them, I'm sure it is. Many opinions are stated as facts. Of course that goes well beyond music.
One last thing. Good music has no expiration date, regardless of what you call good music!
Right on!