2/4 Live Hand, TPTK facing pressure

[tradingman123]

Live 2/4 NL game in Vegas. This is a must move table that just became 3 handed. The villain is new to the game and looks like he is only 12. I have 350 and villain has 250ish. I am on the SB and get dealt AhKh. Button folds and I make it 15 to go. BB calls. Flop is J/7/x rainbow. I continuation bet 25. BB calls. Turn is a K, I bet 40 and BB calls. River is another 7, putting 2 sevens on the board. I check and the villain goes all in. As I went into the tank, he started talking about how he has 3 sevens. Results to follow. I feel like a ck on the river was weak and could induce a bluff. THoughts/comments on all streets?