The following write up  explains so much.
   
   "Ever walk into a room with some purpose in mind, only  to completely forget what that purpose was?  Turns out, doors themselves are  to blame for these strange memory lapses.
   
   Psychologists at the University of Notre Dame have discovered that passing through a doorway triggers what's known as an event boundary in the mind, separating one set of thoughts and memories from the next. Your brain files away the thoughts you had in the previous room and prepares a blank slate for the new locale."
   
   It's not aging, it's the door!
   
    Whew! Thank goodness !!!