This is the test Ron Brownstein with a typically astute analysis of Biden’s current challenges and whether his long experience will now be seen as an asset: The escalating confrontation between Israel and Hamas is offering President Joe Biden a crucial opportunity to begin flipping the script on one of his most glaring vulnerabilities in the 2024 presidential race. For months, polls have consistently shown that most Americans believe Biden’s advanced age has diminished his capacity to handle the responsibilities of the presidency. But many Democrats believe that Biden’s widely praised response to the Mideast crisis could provide him a pivot point to argue that his age is an asset because it has equipped him with the experience to navigate such a complex challenge. “As you project forward, we are going to be able to argue that Joe Biden’s age has been central to his success because in a time of Covid, insurrection, Russian invasion of Ukraine, now challenges in the Middle East, we have the most experienced man ever as president,” said Democratic strategist Simon Rosenberg. “Perhaps having the most experienced person ever to go into the Oval Office was a blessing for the country. I think we are going to be able to make that argument forcefully.” Biden unquestionably faces a steep climb to ameliorate the concern that he’s too old for the job. Political strategists in both parties agree that those public perceptions are largely rooted in reactions to his physical appearance – particularly the stiffness of…