"Normal" is what's normal for you. There are few, if any "normals" in our biology. Even our BP is an individual "normal" measure and we may be normal and ouside the usual range. Forgetting is normal, and some forms of forgetting are genetic but not indicative of dementia. Brad Pitt has a form of forgetting regarding faces. I can't remember names for the life of me and have to constantly try to connect a name with a thing that will clue me to the person's name. Stay active, read and play games--those are recommended as is exercise of ANY type. Go to YouTube and watch Bob & Brad and see what they recommend. IMHO they are tops.