Use reasoning to lead to the answer of the following question:
Of the below sentences, which one does *not* make sense?\nOptions:\n- Sentence A: "Eighty years old is a mighty old age to be."\n- Sentence B: "Eighty seconds old is a mighty old age to be."\n

Sentence B
Eighty seconds is not a long period of time.

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So, the final answer is Sentence B