"Don't underestimate the power of the older consumer"

Apparently some people who buy stuff are older than the 18-34 demographic. I'm shocked too. But studios are discovering that, thanks to DVD sales among older consumers, a movie can earn twice its box office gross. Why are these people staying way from theaters yet buying the movies later? Some say it's the popularity of home entertainment systems. I thought of another good reason but the guy behind me kept talking and now I forget.