The reality is that, at some point in your life, if you can't train others with the knowledge you've gained, you will start to become irrelevant.
You might continue doing what you're doing now, but as you get older, your mind won't be as sharp as it once was, and acquiring new knowledge will become more difficult. You have a choice: either risk becoming irrelevant or share the knowledge you've gained, be humble, inspire passion in others, and hope that some will learn from you and remember your guidance.