Yes, it would be wrong of you. You're not going to cause him long-term damage, but what you are going to find is that his personality and his desires in life are still very much in transition for pretty much the next 5 years or so.
He doesn't know who he is, what he wants to be, what he wants to do, and who he wants to be yet. If he were older my answer would be different. Anyone I've ever met who is 18 or so and dating someone 5+ years older than they are typically have had a bad home life and are latching onto older people out of a need to feel stable. And then they grow to resent that person for not letting them be a kid.
"Well, then," the Cat went on, "you see a dog growls when it's angry, and wags its tail when it's pleased. Now I growl when I'm pleased, and wag my tail when I'm angry. Therefore I'm mad."