General Dementia are usually apparenent with older people and it starts off with very mild to moderate forgetfulness. Some stay in that categorie while other go a bit deeper into the desease into a much more fearfull forgetfulness. Forgeting occasions, events, things that happend yesterday and years ago. While on the other hand, slight short term dementia may just have occasional forgetfulness. Things like what they had for breakfast that morning or where they went yesterday. The slight stage normally the person is very aware that they can not remember as well relating to the present, where a worse case would not remember years ago which is what we call long term memory loss. Short term memory loss in the elderly is not uncommon at all. Yet there are some up into thier 90s that can remember when they were a child and who thier best friend was and where they were born.