Gage entered the University of California, Berkeley, in the fall of 1960, in Honors Mathematics. In 1961, he entered the Alliance Française in Paris, then studied at the Université de Paris. Returning to Berkeley, he became deeply involved in the Free Speech Movement, as documented in Berkeley in the Sixties. He created the first Community Projects Office for the Associated Students of the University of California, placing over 2,000 students in volunteer roles in schools and community organizations in Oakland and Berkeley.