am i getting old

so much to write but so little time
i opened up a new entry page as something came into my mind
just was about to start writing...
someone walked in and had a chat...
the next moment...the writing, the topic and the passion were gone
i can't even remember what was it that i wanted to write on
although moments ago...i felt it so strongly that i wanted to pen it down
how i wish someone can invent a small little electronic notebook that can note down all my thots
so many things come to my mind when i was taking my shower...when i was driving...when i was having lunch...but i just didn't have the chance to write them down....and i can't recall a thing minutes later...
why is that so? am i getting old?