He was taken to Afghanistan years before he turned fifteen.
Second, in spite of everything you may have read, his parents DID run a legitimate charity, they ran orphans.  The Taliban were strongly opposed to the education of girls and women.  Yet the Khadrs orphanages did provide schooling to their own daughters AND the girl orphans.
This is one of the reasons why I remain skeptical every time I read that Ahmed Said Khadr was  a member of al Qaeda, or a member of the Taliban.
Educating his daughters, and the girl orphans, was a brave risk to take.