To grow taller and prevent osteoporosis, besides drinking milk, you should also ensure you get enough calcium and vitamin D. Calcium is a crucial component of bones, and vitamin D helps in its absorption. Exercise is also very important, especially weight-bearing activities like walking, running, and weightlifting, which can enhance bone density. In terms of diet, eat more calcium-rich foods such as dairy products, tofu, and leafy greens. Also, reduce your intake of high-salt, high-sugar, and excessive caffeine, as they can affect calcium absorption and bone health.