When I was 20 or so, I went through a period of what one might call "awareness revolution," when I just ascended to a higher level of perspective about the world. In my naivete, I thought it was a one and done type of thing, however, there are stages of ascension...becoming a parent being a huge one and others as well.
Realizing you are not going to live forever...really realizing it is one of them.
You hear a diagnosis of "cancer" (no matter how curable) and you start looking at life differently. It's kind of refreshing in a way. I wonder if you need to seriously confront your own mortality before you can fully start to savor LIFE in all its glory.