In 18 short months, Facebook has aged seven years. New data from Pew says the median age for Facebook users has gone from 26 in May 2008 to 33 today. So, where have the late 20-somethings started hanging out online? Look around and you’ll find them tweeting away. In December 2008, only 20 percent of people in the 25-34 age bracket used Twitter, but now 31 percent can be found DMing and @ replying. Twitter now claims the second youngest users with a median age of 31. (via Holy Kaw!)