Such advancements shall be ordered only for the better promotion in life of such as are of age, or married, and for the maintenance, support and education of such as are under the age of 21 years and unmarried; and in all cases the sums ordered shall be paid to such persons as, in the opinion of the clerk, will most effectually execute the purpose of the advancement. (R.C., c. 57, s. 10; Code, s. 1678; Rev., s. 1901; C.S., s. 2297; 1987, c. 550, s. 3.)