Osteoporosis, or a condition of porous bone, is a disease in which bones become more fragile. Left untreated, osteoporosis can progress silently until a bone breaks. Around age 30 your bones are at your lifetime best, or your "peak bone mass." After this peak, bone maintains an equilibrium until about age 50 in women and 60 in men. Then, bone breaks down faster than it forms. The resulting bone loss affects both men and women. Bone loss can lead to osteoporosis.
Due to its hormonal component, more women, particularly after menopause, suffer from osteoporosis than men. In addition it may be caused by various hormonal conditions, smoking and medications