Hm, it depends. Men can group up until 21-25, depends on your genes. My dad used to "claim" that he was 5'7" when he was 18, but had a growth spurt when he was 20 and became 6'0" flat(183cm) Furthermore, we all need to consider that you are actually taller in the morning than the evening, so the TIME of when you measure your height may give you different results.