The answer depends on your 13 year old what! And what has your 13 year old possession got to do with your age, anyway?
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.
To determine how many years old you are if you've lived 1 billion seconds, you can divide 1 billion by the number of seconds in a year. There are approximately 31,536,000 seconds in a year (60 seconds x 60 minutes x 24 hours x 365 days). Dividing 1 billion by 31,536,000 gives you about 31.7 years. So, you would be roughly 31 years old.
you have lived 409968000 seconds in 13 years 409968000 seconds
47 years = 1,482,192,000 seconds
12 years is 378,683,112 seconds.
72 years is about 2,272,098,672 seconds.
283824000 seconds.
25 years is 788,923,150 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.
20x365.25x24x60x60=631152000 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.
A 9 year old will have lived through at least 2 leap years, so allowing for that, they will have been alive for 283,996,800 seconds. It is possible they have lived through 3 leap years in which case they will have been alive for 284,083,200 seconds.
To determine how many years old you are if you've lived 1 billion seconds, you can divide 1 billion by the number of seconds in a year. There are approximately 31,536,000 seconds in a year (60 seconds x 60 minutes x 24 hours x 365 days). Dividing 1 billion by 31,536,000 gives you about 31.7 years. So, you would be roughly 31 years old.
at least 1,226,227,704 seconds = 60 seconds x 60 minutes x 24 hours x 365.242199 days x 40 years