What is the oldest written source in this country that mentions this right?

Guyana

According to Title II, persons 18 years or upwards and either a citizen of Guyana or a commonwealth citizen who has also been a Guyana resident for 1 year may vote in elections for Parliament. (Constitute Project, “Guyana’s Constitution of 1980 with Amendments through 2016”).

Voting Rights and Suffrage · Country sources (all rights) · Years mentioned: 1980, 2016 · Last edited 2022-12-28 · Edit on GitHub