You are never to old to learn, our whole lives are spent learning in one form or another.
Learning keeps you looking for new answers and things and keeps your brain active. Whomever told you, you are too old to learn new things, they are fools. I would venture to bet, they probably have not touched a book in years, or read a good novel since they were forced to in school, and probably plant themselves in front of a television, or a bar stool when they are not working. Both of which are a complete waste of time.