156. Technically, a 13-year-old would have lived anywhere between 156 and 167 months (depending on how long they've been 13). As there are 12 months in a year, 12*13=156.
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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.
You have lived about 4,745 days.
He/She can be anywhere from 108 months old (nine years exactly) to 119 months.
72 years is about 2,272,098,672 seconds.