GR translation: Presenting too much more than one mean loss

[Mike Jing]

P229.28-34  And so, one of them—pen, or empty glass—
Is knocked from where it was, perhaps to roll
Beyond the blank frontiers of memory . . .
Yet this, be clear, is no “senile distraction,”
But concentrating, such as younger men
Can easily and laughing dodge, their world
Presenting too much more than one mean loss—

What exactly can "younger men easily dodge" here that older men can't?
Whose world is "their world"?  And what is "one mean loss"?
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