I find it hard to understand how people put a set age on these things. One of my coaches said the brain doesn't repair itself after 35 but I think that's a myth because the brain can not repair itself - only rewire itself since we do not grow any new brain or nerve cells - what we have when we're born are all we ever have.

So what else wouldn't be able to repair itself after 35? Why 35? Isn't that age likely to vary significantly with lifestyle, nutrition (such as antioxidant intake to combat free radicals), genetics etc?