Our oldest daughter just turned 18. She thinks she is suddenly an adult and deserves to be treated to all the priveleges of adulthood. She is mistaken. I want to make her a book (on Shutterfly) with pictures of her growing up years - and filled with things that define people as adults... Just a few thoughts off the top of my head: You are an adult when you are paying your own way. No one pays for your cell phone, your car insurance, or your interenet. You are an adult when someone doesn't have to buy you something so you have a gift to give to one of your loved ones. For example...Fathers' Day. It would be nice if you got a card, a small gift, wrapped it yourself, and gave that gift to your Dad. You are an adult when you put other peoples needs before your selfish wants. You are an adult when you care about someone more than you care about yourself. Really. What things can you guys add? There are so many - I'd love to hear your thoughts!