Answer:
He must worry about his bone strength now.
Step-by-step explanation:
Creating healthy habits that improves not only our bones but the whole body is no easy task. This is because when we are very young we tend not to worry too much about our health and how the care we take in youth will reflect when we are older.
In the case shown in the question above, a boy asks if he should worry about the bone strength in his bones now or when he is 40, 50 years old. The truth is that he needs to worry about it now. At age 40, 50 is the age at which bones tend to begin to deteriorate, this deterioration is delayed if an individual exercised practices that improve their bone strength during youth, because bones are stronger and healthier.