Memory loss alone doesn’t mean a person has dementia because memory loss is an integral part of ageing. Most aged people suffer from memory loss, but that doesn’t mean they have dementia. There are many causes dementia one of which is Alzheimer's disease.
Major cause of age-related memory loss discovered. Scientists say they have discovered a protein deficiency in the brain that is a major cause of age-related memory loss, according to a study published online in the journal Science Translational Medicine.
What Is Dementia? - Alzheimer's Society Dementia Brain Video This video provides a detail description of dementua. It is caused by loss of cells. It is progressive and their is no cure for it. Symptoms vary on the area of the brain it affects.