I kinda don't want to respond since maybe I say something that is misconstrued, so let me preface by saying this: Please don't fuck or engage sexually in any way with teens.
I get the attraction since that's the period human hormones go crazy, but that should fade over time in my opinion. As you get older that age group will appear more and more like what they are, kids. 18 is barely out of high school in most cases. You should also avoid being around them since proximity has an effect on attraction.
Development is complex so I understand there are maturity arguments that can be made on a case by case basis, at least in theory, but in practice, it's just not worth it. More than likely you will hurt someone that thought they were mature but didn't fully understand something. At worst you will ruin their life and your own.
And finding quality ones that will last a long time is more difficult than you might think.
Many of them are made cheaply.