I wouldn’t be sure of that. I read somewhere in an article discussing the same topic that the people most likely to watch her youtube video’s were pre-teens and older men.
While I haven't followed the Miley Cyrus story, it's followed me. Although I've never deliberately tried to see a picture of her, she's almost impossible to avoid, unless you stay out of the supermarkets, off the TV and the internet.
What's always struck me when I have seen pictures of her is how much hoopla has been generated over someone who is so spectacularly ordinary. She's not ugly, but if she walked down a hall at a high school, nobody would turn to get a better look at her. I've never heard one of her songs, so maybe she's a terrific singer. I did deliberately go to Youtube when Spears was popular to hear one of her songs. What struck me was that there was a lot of manipulation of her voice (echo chamber) and that she mostly stood in front and wiggled while all the other more talented dancers did the actual dancing. She was a total media creation, but before the meltdown was quite beautiful. If Disney can make Miley Cyrus a star, they can make anyone a star.