Amends GS 7A-4.20 (governing age limits for judges and justices) as title indicates to change the retirement age of a judge or justice from their 72nd birthday to when they attain 76 years of age.  Amends GS 135-57(b) (service retirement) to change a judge or justice’s automatic retirement date to upon attainment of the new mandatory retirement age. (Currently, mandatory retirement begins the first day of the calendar month coinciding with or next following the attainment of their 72nd birthday.) Deletes outdated language.  Applies to justices and judges serving on or after the act becomes law, so long as nothing in the act is construed to halt the retirement process of a judge or justice that has already initiated that process.