I can be quite forgetful on a regular basis ! I suppose age has something to do with that :)
Forgetting or disremembering is the apparent loss or modification of information already encoded 
My brain must not encode right then.  I do have tricks to remember things though.
It reacts  with  a spontaneous or gradual process in which old memories are unable to be recalled from memory storage.
 Forgetting also helps to reconcile the storage of new information with old knowledge.
remembering, learning and retaining new information are a few of the most common complaints of older adults.
 Retention improves with increased rehearsal. This improvement occurs because rehearsal helps to transfer information into long-term memory – practice makes perfect. 
Memory rehearsal is a term for the role of repetition,