Final answer:
Osteoporosis is a bone disease associated with decreased bone density, particularly in older adults. Age-related processes such as decrease in estrogen, inadequate levels of calcium and vitamin D, and other factors like hormonal changes, diseases, and medications can contribute to bone loss and osteoporosis.
Step-by-step explanation:
Osteoporosis is a bone disease associated with decreased bone density, particularly in older adults. As the body ages, there is a decrease in estrogen, which can decrease the normal deposition of new bone. Additionally, inadequate levels of calcium and vitamin D also lead to impaired bone formation by osteoblasts. Hormonal changes, diseases, and medications can contribute to bone thinning.