Age of candidacy is the minimum age at which a person can legally hold certain elected government offices. In many cases, it also determines the age at which a person may be eligible to stand for an election or be granted ballot access.

Ballot access are rules and procedures regulating the right to candidacy, the conditions under which a candidate, political party, or ballot measure is entitled to appear on voters' ballots in elections in the United States. The jurisprudence of the right to candidacy and right to create a political party are less clear than voting rights in the United States. However, the U.S. Supreme Court has established in multiple cases that the federal constitution does not recognize a fundamental right to candidacy, and that state governments have a legitimate government interest in blocking "frivolous or fraudulent candidacies". As election processes are decentralized by Article I, Section 4, of the United States Constitution, ballot access laws are established and enforced by the states. As a result, ballot access processes may vary from one state to another. State access requirements for candidates generally pertain to personal qualities of a candidate, such as: minimum age, residency, and citizenship. Additionally, many states require prospective candidates to collect a specified number of qualified voters' signatures on petitions of support and mandate the payment of filing fees before granting access; ballot measures are similarly regulated. Each state also regulates how political parties qualify for automatic ballot access, and how those minor parties that do not can. Fundamental to democracy, topics related to ballot access are the subject of considerable debate in the United States.