A. Except as provided in Subsection B or otherwise specifically provided by existing law, any person who has reached his eighteenth birthday shall be considered to have reached his majority as provided in Section 12-2-2 NMSA 1978 [repealed] and is an adult for all purposes the same as if he had reached his twenty-first birthday.
B. For the purposes of the Uniform Gifts to Minors Act [repealed], as it relates to any gift made prior to June 18, 1971, the donee shall not be entitled to delivery or payment over of the gift until he has reached his twenty-first birthday.