The right to stand for election is often subject to various conditions. These may include age, for example the minimum age considered necessary to be able to fulfil certain important functions, registration on the electoral roll of the constituency where the candidate is standing, because it is these voters whom he or she intends to represent, and legal capacity, such as the exclusion of candidates with certain pathological conditions or, somewhat differently, criminal convictions. These are all acceptable if the criteria are objective and rational and do not result in persons' exclusion for political reasons.