Generally, girls are far more mature than guys at that age. I've spoken with many girls who tell me guys are stupid, selfish & too focussed on themselves & getting off, before ensuring a girl enjoys whatever they're doing 'together'. A girl of 15-18 probably has more maturity than a guy aged 17-22. I think it starts levelling out around early 20's, but even then, most couples do have an age difference, with the male being the older partner.
I was in a relationship with an 18 year old when I was 15 and it was perfectly fine. Just stay away from sexual stuff a bit if he turns 18 before your 16 because that can get hairy if anyone ever found out
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