There’s nothing at all wrong with it. Up until the last 20 years, many older men used to enjoy talking with teens, both boys and girls, even having them as friends. Platonic ones, by the way
You won't tell me that this somehow doesn't happen anymore? Disinterested platonic relationships, that is, yes. But this soon diverges into something else:
History shows that most children were married from ages 12 to 20
Especially in desperate settings where there was no better alternative. Or where selling one's kid incurred no consequences, or seemed worth it considering the hardship faced. This cannot be considered to have taken in consideration the actual people involved and their suffering. Today, we know better.
Teens can give off sexual cues without meaning to because of biology.
Yes and no. If you misinterpret their activities and expressions as your own fantasy that they would like to sexually connect with you, you should consult. It's also not for nothing that laws exist to protect them: they cannot be considered responsible enough to understand or consent.