http://www.usatoday.com/news/nation/...-reading_N.htm
The article is from 2007 but I have had heard similar numbers every year. 25% of the population did not read one book in 2007.
"The survey reveals a nation whose book readers, on the whole, can hardly be called ravenous. The typical person claimed to have read four books in the last year — half read more and half read fewer. Excluding those who hadn't read any, the usual number read was seven."
When you include the 25% who did not read anything, that average is going to fall. Half the respondents read fewer then 4 books in 2007.
So I can see where it is possible that many people will not read 100 books in their life time.
My husband is likely to be one of them, he has not picked up a book this year.