The ratings demographics have nothing to do with the music we hear. You can target all you like and you don't get what you want as far as ratings. So they go over the top appealing to females or minority groups. Notice I particularly called out music and not talk or sports radio. I also doubt a station like WPLJ, WWFS or WNSH has only 15% female audience.
Stations look for a demographic position (combination of age, gender and ethnicity) that may allow them to achieve a salable result based on ratings. So the demos in the ratings are the principal driver for any station that wants to be in the top 20 stations in the market.
If corporations wanted to push Chinese music, they would promote it as being popular, put it on the airwaves and then receive the same ratings since that is all that is available for people to hear. They will ram it down peoples throats even if there are no ratings until it becomes mainstream.
Folks have dozens of stations to chose from as well as all kinds of new media offerings. If a station goes with all Mandarin songs, they will probably totally drop out of the ratings and the other stations in the market will increase proportionally.
You want to talk about 50 or over 55, well look at the CBS-FM's old man imaging. What generation do you think they are trying to appeal to with those DJ's and imaging. I like the 80s music and I am old guy but even I get turned off when I hear the old man imaging. That is for the 55-60+ year olds that remember and relate to that kind of sound.
Huh? WCBS-FM targets, principally, 35 to 54 year olds as that is a viable sales target. Yes, there is a large group of CBS-FM listeners over 55, but those listeners are not the target because there is no ad revenue to be achieved from getting those listeners.
You might also look at the CBS-FM playlist... the days of doo-wop and 60's songs are gone. They have moved the core target to 35-54.