My grandfather and his brother and no doubt other members of my past family had alzheimer's disease. I don't know about other members but my grandad started it in his early fifties, possibly late forties. My father sometimes appears to be a little bit on his way but at 68 I think his memory loss is normal and maybe he is not starting alzheimers, certainly not as early as his father. I worry about how I can tell if I'm going to get it, I'm 42 and often forget things that have been told to me. I just have to take people's word for it that they did tell me or that I did say that. I'm sure it's just because I am a very busy person with lots on my mind but at 42 I wonder if there is a way of knowing.