SO, SF, SU, & Meta all launched on different days, anyone know the dates exactly?
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Stack Overflow: September 15, 2008 for Public Beta.
Server Fault: May 26, 2009 for Public Beta.
Super User: July 14, 2009 for Semi-Private beta, August 18, 2009 for full launch
Meta: Some time between SF and SU Beta.
SO and SF had a private beta before and launched a month or so after, couldn't find the exact dates right now.
The official ages of the trilogy sites are:
If I'm not mistaken, the "member for" field is reffering to post-beta dates. You have to add some time if you want to count the beta time.