A Presidential candidate can draw from all United States citizens of voting age.

Although a country may allow all citizens of age to vote, this characteristic does not necessarily qualify it as a substantive democracy.

All citizens 18 years of age or older have the right to vote.

All Israeli citizens 18 years of age or older may participate in legislative elections, which are conducted by secret ballot.

The national literacy rate for citizens 15 years of age and above is over 99 percent.

Any citizen of age 18 or greater must go to an electoral office in order be registered into the electoral census.

Every citizen eighteen years of age or older had the right and obligation to vote, which was compulsory.

A citizen 18 years of age may vote in national elections.

Suffrage is universal for citizens 18 years of age and older.

Its members are elected by all Irish citizens of voting age (which is now 18).