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1. Ask your parents and other people present at your birth. Your parents might remember when you were born, or direct you to other family members or friends who were there when you were born. They may also have a copy of your birth certificate.
To calculate your age based on your Date Of Birth, using an Excel formula, you would need to use the Today function. The Today function returns the current date based on your system clock on your PC or Laptop.This function has no arguments.xcel formula to calculate age from date of birth. To calculate your age based on your Date Of Birth, using an Excel formula, you would need to use the Today function. The Today function returns the current date based on your system clock on your PC or Laptop. This function has no arguments.