semoochie said:
Oldies didn't become a viable longterm FM format until about 1987. There were lots of stations before that but they didn't stay around long because the audience was still too young and fickle. That means that at the beginning of its viability, 1955 was 32 years ago and 1972 was 15. Translated to the present, that becomes 1981 and 1998. This is clearly not a workable scenario and attracting any significant number of 25-54 year olds to it is impractable at best.
And yet they do.
Because they're strong enough in the upper half of 25-54 to do well in the demo as a whole.
Remember, the goal isn't to be #1 in the demo, it's to rank high enough that you're an automatic buy for the ad agencies. Top 10 will usually do.
You have to forget a lot about what worked for Oldies to understand Classic Hits.
You're right that stations like KRTH abandoned Oldies after a short run in the 70s (for KRTH, 1972-1976). But I wouldn't agree that the audience was "too young and fickle". They were aiming at and getting 18-34 year olds. But they were stuck with a very narrow window of music. Top 40 was still playing Beatles and Beach Boys and stations like KRTH that had an AM Top 40 sister didn't want to cannibalize them (though that's exactly what happened when KRTH went AC).
When Oldies came back in '86, it wasn't a roaring success, either. At KRTH, it took Bill Drake, Robert W. Morgan, The Real Don Steele and a strong family resemblance to the old KHJ for it to catch fire. It was at a time when current music was considered largely unlistenable by those then-45 year olds, so they settled in and basically insisted that music began in 1956 and ended in 1972.
That was 20 years ago. They're 65 now.
But today's 45 year olds are a lot more well-rounded when it comes to music. They like current music (which is very accessible and listenable right now). Classic Hits is "part of this complete breakfast" and is no longer about reliving high school.
Programmers are steadily adding newer music into the mix, but it may well be that the best way to prevent another calicification is to stay out of listeners' high school years as long as they're enjoying music they didn't experience burn on in their youth.