Here’s a great explanation that I found to explain why humans stop growing after a point in their lives (usually puberty):
“A long bone, such as your femur (thigh bone), grows in length at either end in regions called growth plates. Growth occurs when cartilage cells divide and increase in number in these growth plates. These new cartilage cells push older, larger cartilage cells towards the middle of a bone. Eventually, these older cartilage cells die and the space they occupied is replaced with bone. When a bone has reached its full size, its growth plates are converted into bone. Long bone growth comes to an end around the end of puberty. When long bone growth stops, you stop getting taller.”
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