It'd have more to do with your channel, I'd have to say. I run a music channel, for which I've been collecting some basic demo information, and I'm surprised to find that my user base is 75% male. Only my teenage females outnumber my teenage males. Overall, approximately 30% in their 40's, 20% are 50+. Wasn't what I was expecting at all.
Additionally, I collect zip codes. So I have cites, states, etc, to pin to a certain demographic. I started collecting this information in the beginning so that I know who I'm catering to. Your numbers, hypothetically, would be determined by the type of content you provide, and what kind of audience you attract. These days with more and more people "cutting the cord", telling your sponsors what kind of people simply OWN a Roku, would be the equivalent of a television broadcaster telling a sponsor who simply owns a television instead of who watches that particular television show.
So unless you feature content obviously geared toward a specific audience (sports, fashion)... I suggest you get started on collecting demographic information! 🙂