If 18-4 listens less to radio, with individuals either not listening or listening much less, that does not affect the PPM numbers as the non- or light-listeners still have meters in proportion to the population and are not "weighted" in any way.My view on the current 18-49 ranking is that those are weighted numbers. If you were to see actual numbers, and not rankings, there would be more actual people in the upper age groups. But in Seattle, there are fewer young people listening to the radio. So formats that might typically skew older are showing higher in the younger demos. For example KSWD is #6 in 18-34. But whatever the demo, Hubbard apparently thinks the size & economics of the audience will make it easier to sell.
What may be happening is that "all" the listening to certain formats and kinds of music are lessened, making CHR and Urban and similar stations do less well and the remaining stations all jump higher in rank.
The way to look at this is with rating, not share. Share only shows "who is left" in this scenario while ration is a percentage of the universe and is not a comparison of station to station but of station to the population in a specific demo.
A quick look at the downtrends of stations like KPWR and KIIS in LA shows that, other than format shifts like the loss of what is now KNX's FM, those stations have a lower rating while ones like KBIG and KOST and even KLVE have increased over the last 18 months in 18-34 share, but not in rating.
So my conclusion is that younger leaning stations that can't play all the songs due to lyric content have lost some cume and, more importantly, TSL. That drops them behind the other horses in the 18-34 race.