Twitter use by 25-44 year olds has grown significantly since late 2010 % of internet users in each group who use Twitter
Although young adults continue to have relatively high rates of Twitter usage, the number of 30-49 year olds who use the service has doubled since late 2010—from 7% of such users in November to 14% in May 2011. This growth trend is especially pronounced among 25-34 year olds—Twitter use for this cohort roughly doubled between November 2010 and May 2011, from 9% to 19%—although growth in Twitter use among internet users ages 35-44 was notable as well (from 8% in late 2010 to 14% in spring 2011). By contrast, Twitter adoption over the same time period was stable among the youngest adults (those ages 18-24) who were the most likely to use the service in our first survey.
Twitter use by 25-44 year olds has grown significantly since late  | 2010  | % of internet users in each group who use Twitter  | 40%  | 19%  | 18%  | 20%  | 16%  | 14%  | 9%  | 9%  | 8%  | 8%  | 7%  | 6%  | 4%  | 4%  | 0%  | 25-34  | 35-44  | 55-64  | 65+  | 18-24  | 45-54  | Nov 2010 May 2011  | Source: Tracking The Pew Research Center's Internet & American Life Project including April 26 May 22 2011 Spring  | Tracking Survey. n=2,277 adult English internet and users ages 18 and older, including 755 cell phone interviews  | Interviews were conducted in English and Spanish 