Could I have Alzheimer's disease at the age of just 18?

Not necessarily. I'm 36 and when I am super stressed I get very forgetful. I guess worrying takes up a lot of space in my brain. I recently started putting reminders for anything and everything in my Droid, and it has helped a bunch. It can't always help me remember that word I really ought to know, but it helps me keep track of everything else.