The genome is a map of our evolutionary travels.
Flow is being completely involved in an activity for its own sake. The ego falls away. Time flies. Every action, movement, and thought follows inevitably from the previous one, like playing jazz. Your whole being is involved, and you're using your skills to the utmost.
No matter who you are, no matter what you did, no matter where you've come from, you can always change, become a better version of yourself.