So I'm a 20 years old guy whose grandmother has Alzhaimer and one year ago I started to have dementia-like symptoms such as mental confusion, difficoulty to concentrate and strong "brain fog", so because of these persistent symptoms I went to a neurologist but he basically told me that I'm too young to eventually develop dementia even though I explained him my overall cognitive decline in the last two years which is difficoulty to live with since I've got to a point where I struggle even with simple tasks, I got really depressed about my issue and the fact that my grandma has Alzhaimer makes me worry even more. So what are the chances I'm really developing some sort of the dementia?