Growing up

"As the chil­dren we once were, grow­ing up was a process of becom­ing adults. Not only bio­log­i­cally but also men­tally. We learned to be respon­si­ble, to pay the bills, to get things done and we learned the com­plex world of adult­hood. To become adults we had to lose our tantrums, silli­ness, our child­hood. And we lost our minds. Our child-like minds." 

http://lifehacker.com/5899592/overthinking-and-your-child-like-mind

As an adult we worry and think way to much over the slightest of details, we expect to know what will happen before it's happened. Yes this does mean we become wiser, but sometimes the beauty of not knowing everything was living every moment without worrying.