The answer depends on your 13 year old what! And what has your 13 year old possession got to do with your age, anyway?
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72 years is about 2,272,098,672 seconds.
47 years = 1,482,192,000 seconds
Since there are 86,400 seconds in a day and 365.25 days in a year, a 9-year old has lived at least 284,018,400 seconds.
A minimum of 504,576,000 seconds but it depends on the time of day you were born and how many leap years you have lived through.
17 years is 536,467,742 seconds.