(Image: AFP via Getty Images)For years, Donald Trump made age and mental fitness his favourite political weapons. ‌Now, with Trump back in power at 79, the uncomfortable question is no longer about Biden at all. They are being raised quietly - and sometimes not so quietly - by diplomats, allies and officials who have dealt with him face to face. But together, they underline a basic truth Trump spent years denying about Biden: age matters, and health matters even more when nuclear codes and global stability are involved. View 5 Images Supporters have grown increasingly concerned about Donald Trump's physical condition (Image: AFP via Getty Images)What makes this moment especially galling is Trump’s own history.