Any testamentary disposition, will, codicil, deed, conveyance, sale, trust or similar instrument executed prior to January 1, 1973 in which the words "minor," "minority" or "majority" are employed, shall, unless a contrary intention effectively appears, be construed to refer to the age of 18 years as delineating the period of minority and the age of majority.
N.J.S. § 9:17B-4