Hi, I had gone through your question and understand your concerns. Some brain atrophy is to be expected for people above 60 yrs old. While dilated ventricles is a direct consequence of this atrophy. While dementia is a clinical diagnosis, it is quite always associated with some brain atrophy. The only reason why you should seek for a specialist consult is first because you are 57 yrs old, but the most important concern, is your memory problems. In my opinion you should do some memory testing, begining with a MMSE, and annual follow ups. There is no specific prognosis on brain atrophy, but you can do some estimation on your memory examination follow ups. Hope this answers your question. If you have additional questions or follow up questions then please do not hesitate in writing to us. I will be happy to answer your questions. Wishing you good health.