Boys and girls follow different patterns of growth and development.
The date that you were born. This is used to calculate your Chronological Age.
The date that you were measured. This is used to calculate your Chronological Age as of the Date of Measurement.
How much you weigh. Weight has important implications for the production of hormones that regulate puberty and can also be a sign of growth.
This is how tall you are, measured from the bottom of your feet to the top of your head.
This is used to calculate your Leg Length, and the ratio of your Torso Length to Leg Length which helps determine Biological Age.