The best estimate is that about 25% of the adult population of the United States will develop varicose veins
Of these, varicose veins are nearly twice as likely to occur in women than men (35% vs 18%). They are also more likely to occur as you get older. By the time you are in your 70s, the risk is well over 50% for men and women. At least 80 million american adults have varicose veins.