The Cincinnati Monocle has found what may be the real definition of hipsterism from a French Writer.
Speaking of Hipsters I've been working on a couple definitions myself. I won't try and define hipster, but instead think about two different levels of hipster: Aging Hipster and Aged Hipster.
An Aging Hipster is not a new term. I define it as simply a hipster who is getting older, likely over age 30. Maybe has a kid, maybe just finally got a 9-5 job. This period can last well into their 40's.
An Aged Hipster is a newer thought under development. One idea I have sees this as a newly found hipster who hit age 50, kids are gone, and wants to be relevant again. Another more simple definition could just be what happens to the Aging Hipster. They finally get old and stop going out to see new bands, but still buy new music online and is sure to Tweet about it.