at least 1,226,227,704 seconds = 60 seconds x 60 minutes x 24 hours x 365.242199 days x 40 years
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you have lived 409968000 seconds in 13 years 409968000 seconds
12 years is 378,683,112 seconds.
20x365.25x24x60x60=631152000 seconds
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.
31556926 in a year x 14 years =441796964 seconds