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

Venezuela

Under the 1999 Constitution of Venezuela, Article 64, all Venezuelans over the age of 18 have the right to vote (Constitute Project, Venezuela's Constitution of 1999 with Amendments through 2009).

Voting Rights and Suffrage · Country sources (all rights) · Years mentioned: 1999, 2009 · Last edited 2022-12-28 · Edit on GitHub