I was reading this article (I don't know why exactly) about Helen Keller (deadblind girl who was taught to communicate)

Anyways, this one paragraph:

Sullivan was hired in 1887 to teach Keller, who had been left blind and deaf after an illness at the age of 11. With her new teacher, Keller learned language from words spelled manually into her hand. Not quite 7, the girl went from an angry, frustrated child without a way to communicate to an eager scholar.
Something just doesn't add up with those ages....

She was born in 1880 so the age 7 seems to fit....

http://www.cnn.com/2008/US/03/05/hel....ap/index.html