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.
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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.
The answer depends on your 13 year old what! And what has your 13 year old possession got to do with your age, anyway?
47 years = 1,482,192,000 seconds
72 years is about 2,272,098,672 seconds.
34.2 years is about 1,079,246,869.2 seconds.