Electoral system
Electoral rules place limits on suffrage and candidacy. Most countries's electorates are characterised by universal suffrage, but there are differences on the age at which people are allowed to vote, with the youngest being 16 and the oldest 21 (although voters must be 25 to vote in Senate elections in Italy). People may be disenfranchised for a range of reasons, such as being a serving prisoner, being declared bankrupt, having committed certain crimes or being a serving member of the armed forces. Similar limits are placed on candidacy (also known as passive suffrage), and in many cases the age limit for candidates is higher than the voting age. A total of 21 countries have compulsory voting, although in some there is an upper age limit on enforcement of the law. Many countries also have the none of the above option on their ballot papers.
Disfranchisement
The United Kingdom suspends suffrage of some but not all prisoners. For example, civil prisoners sentenced for nonpayment of fines can vote. Prior to the judgment in "Hirst v United Kingdom (No 2)", convicted prisoners had the right to vote in law but without assistance by prison authorities, voting was unavailable to them. In Hirst, the European Court of Human Rights ruled that First Protocol Article 3 requires Member States to proactively support voting by authorized inmates. In the UK, as of 2009 this policy is under review as in other European countries like Italy.