I have enjoyed all of my life, I'm still enjoying it as it is such a wonderful thing to do - live! :)
I believe that our life phases change as we get wiser and mature from a child to an adult. We get wiser as we age, knowledge and experience new things. Our activities and life changes from being a kid, to being a parent and an adult.
But then we get days where we find ourselves doing silly childish things, and then laughing at it because it's so much fun? Sometimes we think of doing silly things, the inner voice comes out to stop us because "it's not something an adult would do" right? These examples reminds me of the childhood, so it seems like we are still the same kid, as we were years ago, only that we got wiser and all we did was learned how to act appropriate to the situation.
My conclusion is: all we have to do is find out what we truly love, and how we want to live. There's no such thing as "set faith", there is a thing called "your faith" and you are responsible for it . So enjoy all phases of your life!
My grandmother always says: One is happy if one knows how to be a child at anytime that one wants! :)