What is one of the requirements to vote in Colorado regarding age?

To vote in Colorado, an individual must be at least 18 years old on or before election day. This aligns with the legal voting age established by the 26th Amendment of the U.S. Constitution, which states that citizens who are 18 years of age or older cannot be denied the right to vote based on age. Therefore, for someone looking to participate in elections in Colorado, meeting this age requirement is crucial for eligibility. The other age options provided are not in compliance with the legal voting age established both at the state and national level.