Algeria gained independence from France in 1962 and a new Constitution was passed the following year. Article 13 of the 1963 Constitution held: " Every citizen having reached 19 years of age has the right to vote ." In the 1989 Constitution, Article 62 holds that all people meeting the legal requirements have the right to vote and to be elected (Constitute Project, "Algeria 1989").

References:

1963 Algeria Constitution: “The Algerian Constitution.” The Middle East journal 17, no. 4 (1963): 446–450.

1989 Algeria Constitution: https://www.constituteproject.org/constitution/Algeria_2016