The link in one of my first posts provided the evidence. Defenders are five times as likely as an average person.I have yet to see the proof that heading a ball directly causes dementia. What HAS been shown is that footballers have developed dementia, and that footballers head balls. My mother-in-law gradually lapsed into dementia, and ended up completely out of everything. There must be millions who have suffered from dementia who have never played football in their life...