Well, I'm 16 years old. The only time I ride coasters is during the summer. During that time, of course, I'm not in school. There's not a heavy amount of stress in summer, so I don't really need to escape reality then. ;)
This summer might be different, though, since I'll be getting a job. I can certainly see how adults would want to ride coasters to get away from the horrors of bills, jobs, and anything else that might come along.
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Matt Lynch
Co-Webmaster, Kennywood Boulevard
http://kennywood.coasterbuzz.com