I think the reason why we didn't think anything of dating adults when we were 15/16 years old, yet would be unnerved to hear about a twenty-something year old dating a 15/16 year old now, is the exact reason why adults shouldn't be going after 15/16 year olds. At that age, you think you're grown up and mature when you're not, and can handle things when you can't, and it's the responsibility of the adults to know better and not go after someone vulnerable like that.