misery I think it has to be case by case at that age
I was always flirting with the guys at that age. I lied about my age and easily looked and acted much older. I wasn't having sex with anyone but I wasn't innocent either. I would have charging some 20 yr old for falling for my lies and taking it to the next level.
Both my daughters were sexually active in their teens. I didn't like it but made sure they had the information they needed to protect themselves. By the time they were 16 they weren't innocent. My granddaughter however is. Does she want a boyfriend - Yeah but she lives where freedom to come and go as she pleases is next to impossible so yea she is still a virgin.
Here by the age of 14 a girl can consent to sex with a boy close in age. But developmentally I think in some cases 16 yr and 20 yr is too much of a difference.
But this is a gray area psycholocically and legally. And I would not classify it as pedophilia unluiss like I said earlier that the guy (or gal) is going after a specific age all the time. If he is just hung up on 16 yr olds and dump them when they turn 17 to move on to his next 16 yr old then I think there is a bigger problem going on.
The thing with the psycho-social definition is that it is about what is going on in their heads - what is their fantasy? what turns them on? what are they most likely to act on if given the opportunity? If it is a child who they dump once the fantasy no longer applies then the problem arises pretty quickly.
Pedophiles who target pre-pubescents move on to another child once the present victim no longer fits the fantasy. I see no reason why that wouldn't apply whether their fantasy is 8, 10 , 14, or 16. It would still be pedophilia.