Osteopenia starts at the age of:

Explanation

Osteopenia is a clinical term used to describe a decrease in bone mineral density (BMD) below normal reference values. Lower BMD indicates we have fewer minerals in our bones than we should, which makes bones weaker. Osteopenia is more common in people older than 50, especially women. Osteopenia isn't as severe as osteoporosis, a disease that weakens bones so much that they can break more easily. Up until about age 30, a healthy person builds more bone than he or she loses. But after age 35, bones begin to break down faster than they build up. Some things can make bone loss happen more quickly, leading to osteopenia, such as medical conditions such as hyperthyroidism, hormonal changes during menopause, poor nutrition, especially a diet too low in calcium or vitamin D, and unhealthy lifestyle choices, such as smoking, drinking too much alcohol or caffeine, and not exercising.