Bones are constantly rebuilding themselves. Your body gets rid of old, worn-out bone and replaces it with new bone.
When you’re young, your body makes new bone faster than it breaks down old bone. The result is an increase in bone mass. After the early 20s, this process slows down. Most people reach their peak bone mass by age 30.
After that, bone mass is lost faster than it’s created. That’s because old bone breaks down faster than it can be replaced by new bone. This is what causes osteoporosis.
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