The Pew Research Center's Internet & American Life Project has released Who's Not Online and Why.
Here's an excerpt:
As of May 2013, 15% of American adults ages 18 and older do not use the internet or email.
Asked why they do not use the internet:
- 34% of non-internet users think the internet is just not relevant to them, saying they are not interested, do not want to use it, or have no need for it.
- 32% of non-internet users cite reasons tied to their sense that the internet is not very easy to use. . . .
- 19% of non-internet users cite the expense of owning a computer or paying for an internet connection.
- 7% of non-users cited a physical lack of availability or access to the internet.