A lot of women live longer than men. So, a lot of older people with altzheimers are women. Before modern times, women did not play contact sport and had lower concussion risk, unless it's undiagnosed. (The cohort in question would all have been born before 1950)<p>I'm not saying there's no risk but I am saying it will be multifaceted and multi factor. Avoid concussion no matter what.