Dubya Diction

I just read this mind-numbing interview that People Magazine did with Dubya on his 60th birthday. I'm a little concerned about the use of the word, "retard" in his answer to the first question. COuld it be a Freudian slip?

President Bush turns 60 on Thursday, but it hasn’t slowed him down. On the run, he talks to PEOPLE about biking, bum knees and bad gifts.

What's the last body part that gave out on you?
My knee. My legs are probably next. But I'm working out hard still at age 60, trying to retard age, riding hard (on my mountain bike).