[EMT] Facebook to Reach 152,1 Million Users in the US 2013

This growth will be driven primarily by increased Facebook use among older boomers and seniors. At the same time, teens and young adults will continue to form the core of Facebook’s audience, with penetration rates among these groups ranging from 80% to 89% of internet users by 2013. 

Source:  http://www.emarketer.com/