Finding Yourself

People talk about finding themselves when they are young but I have never understood this. It is not a journey you take once and never do again. People change as they age and have more experiences. You are not the same person you were at ten, twenty, or thirty. Why do you think people go through midlife crises? I am trying to find my new self again and it is an exhausting and stressful process at time but I have never felt that it was not worth it.