I was supposedly mature for my age when I was 15 and I was still light years away from where I was at 18. At 18 I was still way off from where I was at 21, and at 21 I was still pretty far off from where I am now. Think of what you were like at 15 and compare it to now. Do you really think you'd get along with your current self? People mature a lot during the late teenage years and you might as well be in two different worlds.
Of course at 18 you're probably thinking with the small head and not the big one, so none of this is going to matter in your decision. Just make sure you're safe and don't turn her into a 15-year-old mother.
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