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

Grenada

Under Chapter III, Part I, any citizen who is 18 years of age or older may vote for his/her district representative for the House of Representatives unless that right has been legally revoked by Parliament. (Constitute Project, “Grenada’s Constitution of 1973, Reinstated in 1991 and with Amendments through 1992”).

Voting Rights and Suffrage · Country sources (all rights) · Years mentioned: 1973, 1991, 1992 · Last edited 2022-12-28 · Edit on GitHub