BMI category for children and teens are considered for the age 2 to 20 years and above 20 years of age is considered as adult BMI. According to the CDC or Centers for Disease Control, a Prevention category considered percentile calculated base on BMI and age and sex for children. The child BMI charts are different for boys and girls. Adults' BMI is using the same chart as the calculation method is not different for men or women.
IMPORTANT: BMI is not the only indicator to determine health status. Other health indicators also used along with the BMI to get your health status. If you have any problem or want suggest us please feel free to contact us. While our efforts to make this calculator perfect. So, we are not liable by any means for damage for using this online service. Please visit our disclaimer before using this. This is pure as a service to you, so use your won risk.
REF: www.cdc.gov