No, we were both right. The majority are from the 70s-80s but they mainly o||||||||||||||||||jh< ´hgdfsa>ly get 1-3 spins a week. The later a song is, the more they spin it, but there are less songs on the playlist from later on. An interesting strategy, though I'm guessing they're forced to spin the currents that much to stay on the ac panel.
There are "panels" for gold only formats, too. But to be classified as CHR or Churban you have to have a certain number of currents and rotate them a certain number of times a week.
If you play contemporary/pop/light rock/crossover music, you can be CHR, Churban, Hot AC or AC. How many currents you play and how often makes a lot of the difference, but so does the average age of what is played each hour.
BDS and MediaBase have breakout reports for many formats, even ones like Adult Hits, Country, Adult R&B, Adult Top 40, Dance, AC, Hot AC, Regional Mexican, Latin Pop, AC in Spanish, Latin Rhythmic, Hip-Hop, Mainstream R&B, Classic Hits, Mainstream Top 40, Classic Country, and more.
Each station's weekly plays are analyzed and that determines which format category, if any, a station belongs in.
For many stations that don't get any benefit from record company relationships, it does not matter which panel Mediabase or BDS puts them on. Stations subscribe to one or the other to monitory airplay on certain stations they like to observe, just like we used to subscribe to FMQB, Hamilton, Gavin, Walrus!, R&R, BRE, Hits, Hitmakers, Network 40, The Hard Report and the like to see who was playing what.