Older rock, says Michael Eddy (the Younger), "is definitely better." In an article in the Journal and Courier reporting that your musical taste is shaped by the time you are 14, Michael is cited as follows:
"Eddy said his dad, an avid Beatles fan, influenced his music choice. Eddy likes '60s and '70s rock, such as Rolling Stones and the Doors.
Both Joseph [McShurley, Michael's friend] and Eddy think they'll be listening to the same music as they get older.
'I look at my dad and his brothers, and they still listen to the same stuff, so I don't see why that wouldn't be the same for me,' Eddy said."
You can read the entire article
here. (I would note for my nephew that of the 67 mp3 albums that constitute the playlist on my iPod, only 9 came out before 2000.)