Joe Biden has admitted he “can’t say” how old he is during his first interview since quitting the 2024 presidential race. The 81-year-old said it’s “hard for me to get out of my mouth” as he despairingly reflected on the reality of his old age. Speaking to CBS News, Biden said he thought of himself as a “transition president” and stepping aside was in the Democrats’ best interests as it gave them the best chance of defeating his Republican foe, Donald Trump. “When I ran the first time, I thought of myself of being a transition president”, Biden said. “I can’t even say how old I am, it’s hard f…