Multiply the number of years by 365 (days per year) to convert that to days. Then multiply by 24 (hours/day) x 60 (minutes/hour) x 60 (seconds/minute) to get the number of seconds.
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72 years is about 2,272,098,672 seconds.
47 years = 1,482,192,000 seconds
17 years is 536,467,742 seconds.
34.2 years is about 1,079,246,869.2 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.