The teenage years are a prime time to build up strong bones. Most people reach peak bone mass (the point at which they have as much bone as they will ever have) by age 30. The greater your peak bone mass, the more protection your bones will have as you get older. Help your teen limit his or her intake of soda pop by not keeping it in the house. Instead, stock up on beverages and foods that are rich in calcium and vitamin D. Try low-or non-fat milk or yogurt, dark green leafy vegetables, almonds, salmon, and corn tortillas.