Age calculation JavaScript

var yourAge = currentYearYYYY - dobYearYYYY;

if ((currentMonth - 1 < dobMonth - 1) || (currentMonth - 1 == dobMonth - 1 && currentDay < dobDay))
yourAge --;

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The following script also will work, but it ignores leap years.

var yourAge = ((currentDate - DOB) / (24*60*60*1000 * 365)) //Remove 365 to calculate DateDiff