noun
bone age; skeletal age
Medical term used in pediatrics and orthopedics to assess skeletal maturity, often via X-ray of hand and wrist.
骨年齢は手のレントゲン写真で評価されます。
Bone age is assessed by X-ray of the hand.
この子の骨年齢は実年齢
This child's bone age is two years ahead of their chronological age.