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For a woman:

Women generally finish growing in height at 18-years old. The average height for an American woman is 5'4.

For a man:

Men generally finish growing in height by 21-years old. The average height for an American man is 5'10. But a guy will have grown 90% by about 15-years old.

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12y ago
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Wiki User

12y ago

There isn't a correct answer to this. If you are concerned about it ask your doctor. I grew an inch when I was 20:>

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Wiki User

11y ago

Some where aroung 5'5-6'2 feet

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Wiki User

12y ago

176.5 cms

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Q: How tall should a 18 year old boy be?
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