So many older people have great stories to tell, but they don't think they're worthy of telling them.
Let the future decide if it was worth it. If you can remember things, jot them down. Pass them along to your descendants, if you have any, or just put them somewhere they can be found. Don't include anything personal if you don't feel comfortable with it, but do share your impression of the times in which you have lived and the events you have witnessed. Even mundane daily routines give future readers a snapshot of what seemed typical to you.
You won't have to sort and catalogue it. It won't inconvenience you the slightest bit after you're dead. So scribble it out. Who else is going to do it?