Throughout our lives, old bone cells are broken down and replaced with new bone cells. This helps them keep their strength and shape. As we get older, our bones gradually become thinner and more fragile (less dense).
As a teenager or young adult, your bones are still developing and growing. Having some cancer treatments at a young age may sometimes cause bones to start aging earlier than usual. There are things you can do to help protect your bones. If you are worried about this, you can talk to your cancer doctor or nurse.