Don't be discouraged. There's no reason.
Every memory expert agrees that capability of our brains depends on how much we use it. People often misunderstand and think when you're old, you're unable to get the best from your brain. The truth is, your brain is like any musle in your body. It doesn't depend what age you are, you can always imrove your physique. Just have to use the muscles. Same applies here.
I like Margaret's approach. Childish curiosity and yearning, plus experience and knowledge of mature person. Great combination! 
Remember: "If you think you can, or if you think you can't, you're right". (I probably didn't phrase it right, but you get the message)
