I am writing a report on William James, and I need the age that James started reading philosophy for the first time. Can anyone help?
Given that James wrote that:
I originally studied medicine in order to be a physiologist; but I drifted into physchology and philosophy through a kind of fatality; I never had any kind of philosophic instruction, the first lecture on psychology I heard was the first I gave. 
This is probably something of an exaggeration given that his father was a noted Swedenbergonian theologian, and was well connected to the intellectual and literary elites; it's likely his philosophical orientation was fixed in an unconscious kind of way through his families milieu and circle.
 The thought and character of William James, Vol 1 - Ralph Perry