I'm 21 but look 16 is this good ? or bad?

Good because you don't age fast at all.. Bad because, you can't get anywhere until you show ID at all times. Bad because, 16 isn't the type of boy that has hit puberty to his fullest yet.. so, it's up to you to consider whether it's good or not. Take in consideration that the younger you look, (I think) the nicer :)

It's a good thing.

Good in the long run. I'm 22 but I look like a high school teen. It kind of sucks cause I want to look more mature like a woman my age. But whatever... Cause we will look young when we get older!

always better to look younger. once you turn 21 and have ID anyway. before that it kind of stinks :)

When you are 40 but look younger, thats a bonus.

Looking young at 21 is OK but can be annoying when buying alcohol etc.