For the boys, the chronological age was greater than the pelvis bone age and the hand-wrist bone age (p < 0.05) the pelvis bone age was greater than the hand-wrist. Similarly, there was not a significant correlation between pubertal advancement and height age advancement, weight age advancement, or BMI age advancement. For the girls, the chronological age was greater than the pelvis bone age and the hand-wrist bone age (p < 0.05) there was no difference between the pelvis and hand-wrist bone age. In addition, there was no significant correlation between skeletal advancement and pubertal advancement ( r = 0.01, P = 0.9). The variability in bone age at onset of puberty was not less than the variability in chronological age. Pubertal onset was defined by serum testosterone ≥30 ng/dL. Height, weight, and serum testosterone concentrations were assessed every 6 months and bone age (Fels method) every year. With the right lifestyle changes, you could even have a younger biological age than your chronological age. To determine whether this concordance is also present in normal children, we analyzed data from 30 normal boys participating in a longitudinal study. Many conditions that delay skeletal maturation also delay the onset of puberty, whereas conditions that accelerate skeletal maturation often hasten the onset puberty, raising the possibility that skeletal maturation influences pubertal onset.

Bone age greater than chronological age