However, in practice radio stations do this in a more time-restricted fashion. One station (WMTY) cites its range from 'the British Invasion to the Hippie Generation;' that is, from about 1960 to 1974, I guess. Others lean more to 1950s music. But even within those time frames there is some choosiness. I would guess that few older listeners would stand to listen to 'Yummy Yummy Yummy'! I swear; the lyrics were 'Yummy yummy yummy, I've got love in my tummy.' They call the subgenre bubblegum music. It's like swimming in molasses.
More recent music tends not to make the playlists. No 'Smells Like Teen Spirit' or "Baby One More Time.' Kid Rock and Christina Aguilera are not heard from. As a matter of fact: there's no stations that specialize in oldie music from 1995 to 2010, to my knowledge.
The golden oldie concept creeps also into restaurant background music. For dining establishments that don't use classical selections, it usually transpires that show tunes or adult-oriented songs constitute the noise-masking sounds. But, seriously, how often can we stomach "My Way"?*
I think that legislatures should require that each play of "My Way" should be followed afterwards by "The Thong Song."
I know you can take this as a squawk from another millennial with a sense of entitlement. However, we have our own Golden Oldies. For God's sake, play some 1990's and 2000's pop also!
On the other hand, some Golden Oldie music is remarkable because of its badness. Years ago, Dave Barry wrote a Book of Bad Songs. Among those receiving dubious kudos were these gems:
*If you're near a karaoke player, you're sure to hear someone stumble through this one. Some legislatures mandated that each karaoke session include this song, as if the original was not sufficient in its vileness!