Line or Cycle?

I look back on my days, from how carefree of a kid I am, to an eager kindergartener, to a naughty kid and then growing up and getting over my fears in high school up to the 3 months as wirawati in National Service. Those were the best of times in my life, mainly because I know what to expect. I loves waking up everyday.

Still you realise that doing the same thing won't make you happy either. You have to keep moving.
And this evening, I realise there's no such thing as life cycle in human life. There's only one line, one non linear line. You can go up and down but never found yourself cycling.