In recent weeks, attention around President Donald J. Trump has shifted from his policy initiatives to a more personal area: his physical stamina and energy levels.
His ability to sustain long days of public appearances, high-profile rallies, and constant social media engagement has been central to his image as a vigorous, unstoppable leader.
Now, at 79 years old, observers are questioning whether the president can maintain the level of vigor that defined his first term.
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