When did you start forgetting?

thats life, thinking of it im 28 and i can and will forget the most basic stuff,have found myself many times in the kitchen not having a clue why i went there,if its a weekend i have found a good solution, i will just take a coold beer that way i didnt go there for nothing.
sometimes i cant remember what i had for breakfast at lunchtime.
i have lost my cellphone still having it in my hand.
on another hand i can remember the "cardnumber" for a oddball exhaustpart,and i can remember how to bend up some oddball exhaustpipe with lots of bends and angles without said card at work,obviusly not all the time but it happens from time to time,these things makes one think about whats wrong with my memory.
i gues its just right sometimes forgeting the most basic stuff and at other times remembering stuff that is way out there..