Those are Neilsen ratings, so they wouldn't have anything to do with what's listed on a bill. (If I understand the process correctly, the selected Nielsen household has all the viewers in the house put in their age and other info into a device, then indicate when they start watching a show and when they stop.)Has anybody figured that these demos are based on the person's name on the cable or satellite bill?
From experience, the live crowd at the tapings is somewhere around 90% 18-49, and that 10% is more likely to be under 18 than over 49. (The rare 49+-er tend to be Hollywood people in the VIP area who've brought their children.) I would expect that to be the same general audience they would draw if they ever ran events.