How long are knee and shoulder growth plates expected to be open following the closure of hip growth plates?

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It depends upon the age. Because on an average if the hip and ankle growth plates have fused then the knees, shoulder, and spine follow it and close in the next six months of the onset of fusion of the hip and ankle growth plates.

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So in 18 years, the endplates of the bones would have started to fuse, and you can still manage to grow a bit further till the age of 20 to 21 years if you exercise well and eat a wholesome, well-balanced diet, and sleep well for seven to eight hours at night.