Bone is in constant state of turnover with regular withdrawals and deposits of calcium overtime. Bone formation (i.e., deposit of calcium; buildup of bone) exceeds resorption (i.e., withdrawals of calcium, breakdown of bone) during periods of growth in children and adolescents. During early and middle adulthood both processes are relatively equal. Adults reach peak bone mass around the age of 30 ā 35 and adequate calcium, protein, and exercise are important to ensure optimum bone mass in adulthood.