Dean Sam and Castiel are three brothers. Interestingly their current age is prime. What's more interesting that difference between their ages is also prime. How old are they?

Answer: Sam: 2; Dean: 5; Castiel: 7. Age diff 7 - 2 = '5' is prime; 7 - 5 = '2' is prime; 5 - 2 = '3' is prime.

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