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My solution - slightly tailored
I'm not great with math, so I needed to break it down just a little more so that I could follow the logic.
I added a new variable:
var daysPerYear = 365;
Then I thought it'd be neat to prompt the user to enter their own age:
var userAge = prompt("How old are you?");
Then, I created a new variable to do the math separately:
var secondsAlive = secondsPerMin * minsPerHour * hoursPerDay * daysPerYear * userAge;
This way, I can keep my document.write statement a bit leaner and easier to read:
document.write("I have been alive for more than " + secondsAlive + " seconds!");