I have never heard a lifetime story explained with the drinking coffee habits changes. While reading it, I was thinking about myself, and I also some changes, I would add that before drinking coffee, as a kid, I was taking hot chocolate for breakfast every day. I have always added milk and sugar to it, and now changed to sweetener and skimmed milk. :)
I guess, just as life takes it's journey so do aspects of ourselves. We change fashion, likes and dislikes, what we eat and drink and even how we perceive life itself. It's a progression and the experiences we have shape and change it. Coffee too.