You grow up quick. I am not sure how these many years passed so quickly. The memories have value only when you share it with the people.
The people with whom you spent your early days is also important. They have seen us change physically and mentally as well.
Your memories are your own. There is finite amount of time on this planet. The memories last until its document last. Over a period of time it fades away. So, it is important to remember them in your lifetime.