Donald Trump’s decision to make President Joe Biden’s age a centerpiece of his re-election bid has now come back to haunt him after Biden gracefully stepped aside for much younger Vice President Kamala Harris to take her spot at the top of the Democratic ticket. According to a report from Politico’s Megan Messerly and Myah Ward, the former president went to great pains to portray Biden as a “doddering old man” and, with the 59-year-old Harris running an upbeat and energetic campaign, the former president’s latest public efforts have led to his earlier age attacks to bounce back and attach them…