this doesn't seem right to me

Hi, recently I have been speaking to this guy whom I thought was in year 12 (16 on going 17 soon) and I assumed it because of how mature he is and how old he looked too. He also knew I am 18 turning 19 this year and he ends up just telling me he is 16 but in year 11. It is so embarrassing, why on earth would he not tell me sooner?
He keeps saying how he's mature for his age and acts like a 20 year old and he looks older. He says he is fine with talking to me and he likes older women anyway. Isn't this so wrong?
He says he is legal and age is just a number but he is 16 not 17 or 18.
What do I do or say to him? I think the best thing to do is talk to him and block.

It is wrong that he lied to you about his age. But if he's genuine id give him a shot. But only if you really like him. Other than that I'd tel him," I really just wanna be friends because your a little young for me"
I really just suggest you follow your gut, but also your heart. Because you don't wanna regret what could've been, or what couldn't have.