Agree or disagree: 17 year olds should quit acting like kids and start taking life more seirously?

Why or why not? BQ: How old are you? I agree, because 17 year olds are not kids. They are also too old to claim that they don't know what's going on, and they should take seriously anything the is required to be taken seriously, just like any other adult. I'm not buying the "I'm just a kid" game.