Stay young as long as you can. You have inquisitive minds. You're not afraid to make mistakes. You have creative spirits. But as you grow up, the world will try to take these things away from you. They will call you dumb if you ask too many questions. When you make mistakes, they will call you a failure. They will squander your creativity.
Don't let them.
Albert Einstein made scientific breakthroughs in physics because he never stopped asking "Why?". Thomas Edison perfected the light bulb because he wasn't afraid to make mistakes. Leonardo da Vinci made some of the best art in history because he refused to let his creativity die.
Adults are really just big kids who have forgotten how to have fun. Try to remind them from time to time.