The birth date of someone who just turned 21 years old today, March 21, 2017, is March 21, 2024.
To get it, just use a calculator and then subtract the age of the person to the current year: 2017 - 21 = 1996.
If you want to know how long you have lived in seconds, minutes, hours, days, weeks, months, and years since your birth date, use this age calculator from Calculator.net.
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