Just because a particular person graduated when he was 16-years-old doesn't mean the next person would graduate at the same age. The next person could graduate at the age of 17.
And another person could even graduate at the age of 18...it was just like that.
"I'm 17 years old as well, we are age mates". Ryan said to Dylan.
"Wow! That is nice". Dylan stated.
The both of them were bonding more and more without noticing it. They hadn't reached the cafeteria yet, and look at how many things they'd already talked about.
Now, students walking in the compound along with them noticed Dylan conversing with Ryan. Not all noticed though, some didn't care at all.
But the ones that noticed had thoughts running through their minds here and there. They were wondering why Dylan chose to go start conversing and bonding with Ryan when others were displaying trashy attitudes toward him.