How many seconds old is 12 years old?

Answer 1

(12 yrs) x (365.25 days/yr) x (24 hrs/day) x (60 minutes/hr) x (60 sec/minute)

= 378,691,200 seconds.

Note: This answer is only true on your 12th birthday at the same hour, minute, and second as the time you were officially born. One second later, it's not true anymore.