All orders or final judgments duly entered in any action or special proceeding prior to April 8, 1974, when any of the defendants were infants or incompetent persons, whether residents or nonresidents of this State, and were defended therein by a general or testamentary guardian or guardian ad litem, and summons and complaint or petition in said action or special proceeding were duly served upon the guardian or guardian ad litem and answer duly filed by said guardian or guardian ad litem, shall be good and valid notwithstanding that said order or final judgment was entered less than 20 days after notice of the summons and complaint served upon said guardian or guardian ad litem.
N.C. Gen. Stat. ยง 17