Started reading four days ago I’m devastated it isn’t complete I’m totally hooked �...

So I’m confused with something
Enisha says in last chapter that Kahil is not even 18y yet, BUT she’s 15 minimum and when se was just a baby (like less than one year old) was when he was sent to Hyperion, and he definitely didn’t look like he was just 3y old, but like at least 6, so I tought the age gap was bigger. And now author says it’s what? just 2 years?