Oprah Daily reports while bones grow weaker with age, peak bone mass is acquired by age 18 in girls (age 20 in boys) and bone mass continues to grow until age 30. HSS sports medicine surgeon Sabrina M. Strickland, MD, emphasizes the importance of building bones during their peak growing season (your 20s) which fortifies them against fractures, breaks and a stooped posture. In your 30s protection of fully grown bones against thinning is possible by doing kettlebell weight exercises. 

Read the full article at Oprahdaily.com.