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There is no perfect weight and shape for any given height.
You determine the right weight that is perfect for you by guessing and adjusting with what weight you are comfortable beginning with.
236 lbs that's how much i weigh i just turned 13
~135 depends and there's no perfect weight only unhealthy and healthy
You cannot judge a "perfect weight" on age. It is judged on height. There are plenty of height > weight charts online.