Between November 2010 and May 2013, the percentage of internet users on Twitter more than doubled for every adult age group except those ages 65 and older. The increase was most pronounced among those between 30 and 49 years old, who saw penetration rise 142.9%, to reach 17%. And three out of 10 millennials used Twitter in May, compared with 14% in late 2010.
There are some notable differences in the demographic breakdown on Twitter vs. social networking overall. General social use skewed female, Pew found, at 74% of women vs. 70% of men. On Twitter, the breakdown was more gender neutral, with men holding a very slight advantage, at 18% penetration, vs. 17% of women. Read the rest at eMarketer.