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Here's my code(I also found a cool method that does comma separation)

var secPerMin = 60; var minPerHour = 60; var hourPerDay = 24; var daysPerWeek = 7; var weeksPerYear = 52; var yearsAlive = 28; var secondsAlive = secPerMin * minPerHour * hourPerDay * daysPerWeek * weeksPerYear* yearsAlive

document.write("I've been alive for more than " + secondsAlive.toLocaleString('en') + ' seconds!')