Best stage in life?

Regardless of what your age is right now, what do you think is the best stage in life?
Personally, I believe that majority of us feels the best time was the time being a child, a lil kid who plays around without worries.

Those are the times where we don't even know how to care about what people say about us, how to take into consideration on how people feel about our appearances, we don't have to worry about what to do tomorrow to survive and compete with people with lots of intention out there.
But without realising how time's ticking, we grew up as person with self-consciousness.

So now I understand what mom told me when I was 5, she said she envy me so much 'cause she can't go back to study life anymore.

Do you remember since when you emphasise on making up and grooming so much whenever you're leaving the house?
Do you remember since when you no longer depend on your parents so much, and start living your own life?
Do you remember the day where you talk back your parents and defy what they wanted you to do?

Normally, no one does remember.

If we're advanced enough, I hope scientists can bring us back to my childhood life so that I can have a peek on how happy I used to be.