He was trolling you. As a general guide, you should be at the lowest weight you can make comfortably. Genetics are different for each person but you sound like you are at a reasonable weight for your height
Are you a man or woman? If a man Northpaw is correct it depends, what kind of build you naturally are, what kind of build you are looking to be, if you are a woman, helloooooooooo.
Calling it now 5ft10 but really 5ft4 70kg lean but really 70kg flubber 16" puppy fat arms. I have seen 5ft10 70kg lean guys and they have great arms @ 16" something a kid wouldn't have Most little lean guys with decent looking arms actually measure really small on tape 16" isn't huge but for a bloke that small they are. Obviously you could have fat arms but you would have to have tiny legs
It's easy if he's already lean he should be 70kg, kids shouldn't be cutting huge weights 66kg @ the bare minimum, 63kg is delusional
Yep...but not knowing underlying conditions, dietary knowledge & training program - I'd steer clear answering that in a forum imo
You never know if he diets too hard as a kid he could stunt his growth Daniel Dubois was 75kg @ 15/16 and now look at him and he's only 19