Looking at the current test team first minus Gilly (allready retired) then the likely's or up and comers.
Most will retire at the end of the Australian summer in the year mentioned. I have given batsmen and spinners a few extra years on their "use by" than pacemen (and subtracted some again for the fragile Tait and Watson)
Keepers I think "36" is about the magic number considering reflexes required.

Hayden...36yo....est.ret..2010
Jaques....28yo....est.ret..2017
Ponting...33yo....est.ret..2012
M.Hussey.32yo..est.ret..2013
Clarke.....26yo....est.ret..2019
Symonds.32yo...est.ret..2011
Haddin....30yo...est.ret..2014
Hogg......36yo...est.ret..2009
Lee........31yo...est.ret..2011
Johnston.26yo...est.ret..2016
Clark......32yo...est.ret..2010

Of the outsiders

MacGill....36yo...est.ret..2009
Warne.....38yo...est.ret..????...(There is a medium strength rumour currently doing the circut's)
White......24yo..est.ret...2020
Bailey......22yo..est.ret...2022
Cullen......23yo..est.ret...2021
Watson....26yo..est.ret...2015
Bracken....30yo..est.ret...2012
Noffke......30yo..est.ret...2012
Tait.........24yo..est.ret...2015
Hilfenhaus.24yo..est.ret...2018
Siddle.......23yo..est.ret...2019
Ronchi......26yo..est.ret...2018
Rogers......30yo..est.ret...2014
D.Hussey...30yo..est.ret...2015
Hodge.......33yo..est.ret...2011
Voges........28yo..est.ret...2016
Pomersbach.23yo.est.ret...2022