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Option 4 : Pen

Let the Zen’s age be x years.

So, Pen’s age = x + 6

Sen’s age = x + 6 - 7 = x - 1

Ben’s age = x - 1 + 2 = x + 1

Ken’s age = x + 1 - 5 = x - 4

→ x - 4 < x - 1 < x < x + 1 < x + 6

→ Ken < Sen < Zen < Ben < Pen

Hence, Pen is the eldest of all.
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