As the years go by, we apply, and hopefully learn from our life experiences.
Naturally, we become more mature as time passes.
The key is to find moderation in all we do...to not let bitterness be the singular result from disappointments - and yet, also - to not become completely selfish when things may for a time at least...continually go our way.
Again, the answer is found in balance.
To make mature decisions, be responsible and take and be in charge of our lives at every turn - but also to make sure we never lose the child's heart and carefree spirit.