He is not fucking them god damn it!
What if is he attracted to 15 years old boy? Should he fucking kill himself?
Come on get real! He is probably a lonely person with a fucked up mind, I agree with that or at least that's what it COULD be, but he is not hurting anyone and probably if for all these years he hasn't done a thing to anyone he will continue like that.
He probably knows that it's not ok to engage in sexual stuff with underage boy especially if you are 50, maybe that's just his way to keep his desire at bay, it must be a pretty shit life when your brain make you like stuff that you should never DO!
I know plenty of men that has a thing for fresh meat, plenty of men would fuck girls of 16 years old, I mean what the fuck go out and have a look, half of those 16 years old girl looks like they have 20!!!! They behave like grown up girl and they suck more dick then you can imagine. I'm not saying that is OK to fuck underage person, but having few thoughts now it's illegal and you should burn for it?
If your problem is because he has HOMOEROTIC fantasy... well grow a brain