Where are you referring to? The age of majority (what defines whether you are an adult - and so in control of your actions and decisions) varies around the world (it ranges from 15 to 21) and even within countries - e.g. within the UK, the age of majority is currently 16 in Scotland but 18 in Northern Ireland, [England and Wales] (http://www.legislation.gov.uk/ukpga/1969/46/contents). Even within the US it varies from 18 to 21 depending on the state and territory - Colorado for example is one of the States with an age of majority of 21 but where 18 applies for many aspects of adulthood.