I think mum has early onset dementia (she's in her 60s) but her behaviour and memory baffles dad and I. She will hide things in empty liner bags (toothbrush, soap etc) and then forget where they are, but she will offer to take my plate through to the kitchen. Some times her memory seems fine, she can remember musical lyrics, but then she suddenly goes blank. Is this usual behavior for someone with early onset dementia because dad isn't convinced it's dementia but I think it is. I think she is trying to mask that she has a problem by trying too hard, but she has said to me that something is wrong, so I think sometimes she is aware there is a problem.