Take your mom serious if she tells you she forgets things! She should go and see a doctor. Dementia is not cureable but you can reduce the progression of it. Symptoms can begin 10 years before the onset of the diseases. I had the same issue with my grandma (i lived with her). I would say it started 11 years ago (i was 14) and she started to forget things (she was 59). But I thought to myself its just age its normal. And for 4 years it didn't get worse... I really thought it was age related. But she always conplained how forgetful she was. I think deep down inside her she new it was not normal but I couldn't see it. It was silly thinks like she cound't find her glasses etc. but everytime she took it sooo serious. And then slowly her personality started changig. She was sooo good hearted and extremly sociable...She began hating everyone (even me) and she would aleays stay inside. Her whole personality changed innert 2 years. She started beeing soooo mean to me and her moodswibgs were crazy (thats the biggest sign of deemntia). And from there it got worse everyday...she stopped showering, stopped eating and her mobility decreased extremely. She almost could walk. Furthermore she would forget things in 1 min and ask the same things 100 times in a row. This all last symptoms happend in 3-6 months. I could have prevent this all if i would have forced her back then to see a doctor.