it's because of calcium deficiency that a person backbone is weakened, no matter how u try to strenghten your backbone, it's due to the food we're taking, thats right, our diet, most of us are eating processed food now a day and these food are mostly causing acidity in our body and our bone marrow has to release calcium ion to balance the body PH, eventually, the sign show up. so, it's no more old people are calcium deficiency, young people started to show the sign too now a day