How much should a 5' 7 tall teen weigh?

Well depends how old you are like 13-17..

I'm 13, I'm 5ft7, weight a little over 150 lbs.

13 - 130 lbs - 150 lbs in average

14 - 135 - 155

15 - 140-160

16 - 145 - 165

17 - 150 - 170

Those are average for 5ft7 in my opinion

If you are a girl than it's different than that, ALOT different