N.M. Stat. § 13-7-8
Maximum age of dependent.
Any group health care coverage, including any form of self-insurance, offered,
issued or renewed under the Health Care Purchasing Act on or after July 1, 2003 that
offers coverage of an insured's dependent shall not terminate coverage of an unmarried
dependent by reason of the dependent's age before the dependent's twenty-fifth
birthday, regardless of whether the dependent is enrolled in an educational institution.