Version GA Support End
4.3 10/1997 12/2001
4.3.3 09/1999 12/2003
5.1 05/2001 04/2006
5.2 10/2002 04/2009
5.3 08/2004 04/2012
6.1 09/2008 04/2017
7.1 09/2010 TBD
7.2 10/2015 TBD

Source: AIX Lifecycle