To be eligible to vote in Tennessee, you must be a citizen of the United States. You must be (18) years of age or older on or before the date of the next election. You must be a resident of Tennessee. View Guidelines for Determining Residency and special considerations for Homeless Persons Residency and Non-resident Property Owners. You must not have been convicted of a felony, or if you have, your voting rights must have been restored. View Restoration of Voting Rights. In order to participate in an election, a qualified voter must be properly registered no later than thirty (30) days before the election. The election commission office will process any by-mail voter registration form that has been postmarked at least thirty (30) days before the election. T.C.A 2-2-109.