Twitter Skews Young, LinkedIn Skews Old [graph]

The chart  below, from Statista.com, illustrates the age structure of social networks in the United States. 

50% of Twitter's unique visitors in October 2013 were younger than 35 years, while 2/3 of LinkedIn's users were older than 35. 

Facebook apparently appeals to people of all ages, but it still lags behind Linkedin with the gray hairs (um, yeah, that would be me).