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By deduction using this info. "got involved in the anti-war movement in 1967, during a time when he was frequently being expelled from schools and arrested for rebellious behavior. In the late 1960s he began distributing radical literature and working with the Black Panther Party in southern California, writing his first article on incarcerated Panthers in 1968.", he was about 16 in 67, so therefore 54 +16 = 70 years.
I will make a Sherlock Holmsian guess he was 70 yrs old when he died.