Why do we stop growing ?

In general your doctor can guesstimate what height or weight you will be when you stop growing. Why do we have to stop growing; why cant we just keep growing? What tells us we must stop growing; Is it possible to keep growing? In 7th grade I was 4'8 and my doctor told me I would not pass 5'2 and 115 lbs. I am now 5'0.5 and 104lbs. Doctors use your parents height and weight, and your growth rate to come up with an estimate of what you will stop at; so are your genes the top control of your growth?

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