Understanding bone health begins early, as 90% of bone mass is established by age 18. Factors like poor diet, sedentary lifestyle, and certain medications can hinder peak bone mass, leading to conditions like osteoporosis later in life. Hormonal changes, particularly decreased estrogen in postmenopausal women, also play a significant role in bone density loss. Awareness of these contributors is crucial for maintaining strong bones and preventing chronic health issues down the road.