The first time you notice that something’s a little off with your parent can come as a shock. Maybe Mom suddenly becomes rude when you ask her if she needs help doing something. Or Dad refuses to discuss finances with you when you ask a polite, passing question. You may even brush it off, chalking it up to old age. But then, if that off-ness progresses to big red flags, like not remembering that they spoke to you yesterday, or they forget the directions to the store they visit every week, it starts to become more of a worry.