I'm 41. I listen to Katy Perry all the time. I've never heard of Missy Elliott. I can dismiss that by saying maybe I'm not average.
> people with children (inferred from listening habits) listen to a smaller amounts of currently-popular music than the average listener of that age
This is one that I have a hard time believing. Now that my son is starting to listen to music on his own, I get exposed to currently-popular music all the time. For a long time I only listened to the old stuff. I don't know anyone for whom that is not true. I don't even understand how that can be true in principle - is it really the case that being exposed to currently-popular music causes you to listen to it less?