Your preservation age means how old you have to be to start using your super. Until then, your super's preserved. The Australian Government sets these age limits.

Date of Birth Preservation age
Before 1 July 1960 55
1 July 1960 to 30 June 1961 56
1 July 1961 to 30 June 1962 57
1 July 1962 to 30 June 1963 58
1 July 1963 to 30 June 1964 59
1 July 1964 or after 60