Calcium deficiency in old age leads to which disease?

A chronic deficiency of dietary calcium or poor calcium absorption in elderly adults leads to a progressive loss of bone mineral density, making bones fragile and porous. This condition is known as Osteoporosis.Rickets occurs in young children due to Vitamin D/Calcium deficiency.Osteomalacia is the softening of bones in adults, primarily due to severe Vitamin D deficiency.Anaemia is caused by iron or Vitamin ${\text{B}}_{12}$ deficiencies.