§ 472-n. Statements as to age. In all cases under this article where children shall come under the care, custody or control of said corporation, the age of such children shall, so far as said corporation is concerned, be prima facie deemed and taken to be correct as stated in the written surrender of the parent or guardian, or the order of placement or commitment by a family court, or in the transfer or placement by any agency at the time of placement, admission or commitment.