Six persons are seated in a row facing north. Each has a different age, but their order is unknown. Given the following clues: C sits 3rd from one end...

Six persons are seated in a row facing north. Each has a different age, but their order is unknown. Given the following clues:

• C sits 3rd from one end.
• The person who is 12 years old sits 2nd to the right of C.
• The number of persons to the right of the 12-year-old is equal to the number of persons to the left of D.
• O sits 2nd to the right of the person who is 6 years old.
• Two persons sit between D and B, and B's age is twice that of D.
• N sits to the right of P.
• The person who is 36 years old sits 3rd to the left of the person who is 15 years old.
• O is 18 years old.

Question: Who sits at the extreme end of the row?