Your age is
The age calculation is based on the difference between the user's birth date and the date they wish to calculate their age for. The JavaScript code calculates the time difference between these two dates in milliseconds, and then converts it into various units of time such as seconds, minutes, hours, days, months, and years.
The calculation of age in years is based on the number of days in a year, which is approximately 365.25 days. This is because a year is not exactly 365 days long, but actually slightly longer due to the fact that the earth's orbit around the sun is not a perfect circle, but rather an ellipse.
The calculation of age in months is based on an average of 30.44 days per month. This is because the length of a month varies slightly, with some months having 30 days and others having 31 days, and February having either 28 or 29 days depending on whether it is a leap year or not.
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