Memory loss or forgetfulness is not always due to some pathology or disease conditions. Loss of memory is a part of normal aging process as well. As you get older, changes occur in all parts and functions of body, including brain and brain cells. Age related memory loss differs from the memory loss due to dementia or Alzheimer's disease in significant ways. For example, you may lose your keys once in a while and later remember where have you kept them, when aging is responsible for your poor memory. However, you may repeatedly misplace your keys and do not remember even later, in case of memory loss in Alzheimer's disease.