When you look at 16,17 or 18 year olds they look to old.Whydo they do that? 'cause there in hollywood and also they grow up way to fast. For example Miley Cyus. She looks like she's 20 instead of 17. Also Demi and Selena do too. They try act like someone there not. They also don't act there age. They act like there 20 years old.