I have described why we get older in this way. This picture shows exactly what I meant (a total trip, but not unexpected to me).
As we pass through the template of what contains the rules of the universe (physics and metaphysics), that template is stationary, while we move through it as we travel in space. As we pass through this template bits of what makes us up individually, on an atomic scale are left behind. This is due to sheer friction of our atoms passing through this universal - rule containing template on a micro micro level.