To prevent osteoporosis in the elderly, it's important to maintain a balanced diet rich in calcium and vitamin D, such as dairy products, legumes, and green vegetables. Moderate sun exposure and regular exercise are also crucial as they help with calcium absorption and bone health. Goat milk powder can be a source of calcium and other nutrients, but it is not the only option. Remember, a healthy lifestyle is more important than relying solely on supplements. If there is a risk or signs of osteoporosis, it's best to consult a doctor for a personalized prevention and treatment plan.