All widows of Confederate veterans who have reached the age of fifty-five years shall receive annually from the pension fund the sum of one hundred and sixty dollars and all other widows of Confederate veterans who have attained the age of forty-five years shall receive the sum of one hundred twenty-five dollars; provided, in either such case, that any such widow was married prior to December 31, 1920 or for a period of at least ten years prior to the death of her veteran husband. The pensions shall be paid at such times as may be fixed by the Comptroller General.