Quote:

People are only interested in what they grew up with from around age 15-25.




using the Billboard "Hot 100" archives (use the arrow buttons under the banner)

http://www.billboard.com/charts/billboard-200#/charts/hot-100?chartDate=1958-08-10

you can view the top 10 songs by week back to August 1958. It is quite obvious that I have never been a "top 40" listener. But I do stop recognizing names at about age 25. Funny.