15% of U.S. adults do not use the internet.  Who are these people?

A recent Pew Research Center study revealed that 15% of Americans aged 18 and older, do not use the internet.  As expected, 49% of these people are over 65 years of age.  Here is a breakdown from the survey that outlines the groups who do not use the internet. 
The next logical question is "why don't these people use the internet?"  The number one response was "Just not interested."  21% of non-users gave this as their reason to why they don't use the internet.  The next four were "Don't have a computer" (13%); Too difficult/frustrating (10%); Don't know how (8%); and "too old to learn" (8%.)

One of the more interesting revelations of the study is just how quickly internet use has become almost universally adopted.  In 1995, internet use was 14%; by 1998 it had more than doubled to 36%; it hit 50% in 2000 and now stands at 85%.

Overall adoption stands at 85%, but 9% only use the internet at work.  So only 76% access the internet at home.  How mobile affects these numbers was unclear.

Obviously as older people die, the percentage of internet users will increase, but expect that there will always be a small percentage of people who will not adopt the technology.  As hard as it is for some of us to believe, not everyone wants to use computers.