 A raspy and sometimes halting President Joe Biden repeatedly sought to confront Trump in their first debate ahead of the November election. But Biden's uneven performance crystallized the concerns of many Americans that at the age of 81, is he too old to serve as president? It also sparked a fresh round of calls for the Democrat to step aside. Meanwhile, the 78-year-old Trump's rhetoric offered Americans an unwelcome reminder of the bombast that he had launched into America.