Why is my height not increasing at 21?

By the age of 21, your growth plates (epiphyseal plates) have likely closed, meaning that your bones are no longer able to grow longer. Factors that may explain why your height is not increasing include:

• Genetics: Your genetic makeup largely determines your height. If your parents or family members are shorter, this may explain your height.
• Hormonal changes: Conditions such as growth hormone deficiency or thyroid issues can affect growth, though this is uncommon after puberty.
• Nutritional deficiencies: Lack of nutrients during your growing years could affect height potential, but this would primarily be noticed during earlier developmental stages.
• Closed growth plates: Once these close, usually after puberty, no further growth in height is expected.