Unemployment is a state where a person wants to work but is unable to find a job. According to the formal OECD definition, the unemployed comprise all persons above a specified age, who during the reference period (typically a week or a month) were not in paid employment or self-employment, available for work, and actively seeking work. An important distinction is between long-term unemployment (with a duration of 6 months or more) and short-term unemployment. Unemployment is different from nonemployment, as the latter includes those not available for, and seeking, work, including students and retirees.