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The \(30\) school student's age (in years) are given below, then find the mode of their ages.
 
1217, 129, 17, 14, 17, 14, 9, 14, 12, 14, 9, 12, 14, 17, 14, 9, 17, 12, 14, 9, 17, 9, 12, 12, 17, 9, 14, 17.
 
The mode of \(30\) school student's ages \(=\) ii
[Note: Insert the answer in ascending order].