Collingwood now retire after Last Ashes Test?

Now on the Sydney Final and last test match of the Ashes Series ongoing after this match Paul Collingwood told that this match will be his last match. He is 34-year-old middle order batsman. Collingwood said that he is sure by the end of this Test he will know more his self and be better able to judge what the common feeling is in terms of where he is as a Test player and the giving he can still make to the England team in future and what is the best way forward."