When bubbles fascinate you, and how fun it is to twirl with your hands outstretched so that when you stop, you're surrounded in bubbles.
When you wear a freshly picked flower in your hair.
When you get more excited about coloring books than the kids do who you brought them out for.
When you get really excited about snow.
When you go puddle jumping with a friend and make up songs about the rain.
When hide and seek is still fun.
When you get just as wide eyed at magic tricks as the kids do.