Final answer:
The elderly condition where bone tissue lacks calcium is called osteoporosis, a disease marked by reduced bone density, higher bone fragility, and increased risk of fractures.
Step-by-step explanation:
The common condition usually associated with the elderly where bone tissue is deficient in calcium is known as osteoporosis. Osteoporosis is a bone disease characterized by decreased bone density, which happens when the rate of bone resorption exceeds the rate of bone formation, especially as the body ages. Several factors contribute to this condition, including deficiencies in dietary calcium and phosphate, poor absorption of calcium from the intestine, hypoparathyroidism, and low levels of vitamin D in the body.
As a person ages, hormonal changes, diseases, and certain medications can also contribute to the thinning of bones. Osteoporosis leads to bones that are brittle and susceptible to fractures even with minor stress. It is the most common cause of broken bones in the elderly, often affecting the proximal ends of the femur, vertebrae, and wrist.