Anecdotal example:
My folks are in their early 70s.
They both love new country music, both are content listening to classic rock, and my dad also likes 90s and some 00s rock. In fact, he listens to the local Active Rock station on occasion in his truck. My mom partakes in the Adult Contemporary station on occasion.
Never once has either complained that the local radio dial lacks options for people "their age." (Coincidentally, their market has a 60s / 70s Oldies station on a major FM signal, but that is probably option #3 at best.)
CTListener hit the nail on the head, in my opinion.
By the way, when I was in high school, the median song age on classic rock radio was about 25 (median release year was 1970-ish). Recall many early classic rock stations even ran a liner proclaiming "it doesn't have to be old to be a classic!" Today, the median song age for classic rock is probably in the neighborhood of 40 years (median release year is probably 1985-ish).