4.81.85 cm
You cannot judge a "perfect weight" on age. It is judged on height. There are plenty of height > weight charts online.
Your height is basically inherited, nothing you can do at age 16 will change the height you are meant to be.
He was 6'7'' age 16
5' 9"
You may get a Restricted Driver's License at the age of 16 in Washington state, and a Full, Unrestricted Driver's License at the age of 17 with a perfect driving record or at the age of 18 if you do not have a perfect driving record.
Weight is 115 max, no height limit, and 16 is the minimum age.
26 year and height is 4.8
For an ideal BMI at your height, between 51.95 and 70.1kg.
I would say probably around 185cm. At 16 i was 183cm now I'm 18 and 185cm if i look at height growth tables my final height will be 186cm at 19. So if Arnold final height was 188cm he was definitely around 185cm at age 16 ;) sorry for my English.
There is no perfect weight for a given height. Instead, there are a range of healthy weights depending on age, build, muscles, etc.
5.7 to 5.10
1.85 cm is the perfect height