There are two kinds of pain: clean and dirty pain. Here is an example of clean pain: someone you love dies. It is like a sharp knife cut; it heals evenly, with less scarring.
Then there is dirty pain. Here is an example of dirty pain: Someone you love betrays you. This is like a jagged knife cut; it heals poorly, with more scarring.
I am trying to live a life that allows me to survive clean pain and that minimizes dirty pain. Age is not just a function of years; it is a result of injuries. The injuries, and particularly the scarring of your soul, costs you more life energy than the simple passing of time.