1985 by bowling for soup in 2005 was about 20 years prior.

It’s now 20 years after that song came out.

Edit: whoops it was a 2004 song. Meaning, actual 1985 was only about 19 years prior, and now that song is 21 years old. So, there’s more time between now and that song than there was between that song and actual 1985.