Among Internet users ages 50+ overall, social network use increased from 22% in April 2009 to 42% in May 2010. To boot, 10% of the 50+ cohort uses Twitter or a similar “status update” service, either to post updates or check other people’s updates.

Looking at specific age cohorts, social network use among Internet users ages 50-64 surged from 25% to 47%, with 20% of this group saying they check into social networks on a daily basis — up from 10% last year. Meanwhile the proportion of Internet users ages 65+ using social networks doubled from 13% to 26% over this period, with the number checking in daily jumping from 4% to 13%.

See the full report here.