Final answer:
Osteoporosis is a bone disease associated with decreased bone density in older adults. It occurs when the rate of bone resorption exceeds the rate of bone formation, resulting in weakened and brittle bones.
Step-by-step explanation:
Osteoporosis is a bone disease associated with decreased bone density, particularly in older adults. It occurs when the rate of bone resorption exceeds the rate of bone formation, resulting in weakened and brittle bones that are more prone to fractures. This condition is caused by an imbalance in calcium and phosphorus metabolism.