13 × 12 = 156 months if using full years.
Note: there are 12 months in a full year.
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9 years x 12 months in a year = 108 months
96 months old. Then start in January and count how many months until your birthday and subtract it from the answer.
He/She can be anywhere from 108 months old (nine years exactly) to 119 months.
If you are thirteen years old, you would be 156 months old. 13 x 12 = 156.
If you are 4 years of age then 4 times 12 = 48 months