im 17, 5'9 height, weigh 56k ( thats 9 stone

Im quite a strong fit guy and max i do is 5 reps at 65kg

max i ever lifted is 85Kg but you shoudn't do that as 1 lift does jack all and its bad for you especially if you are under 18.

Mind you my bro-in-law is a former professional swimmer and he's about 6'3, 11 stone 6 but can easily press 120-140Kg so it really depends on how fit and strong you are (obviously lol)