Well, honey, if you were 31 years old, you were born in 1990. Simple math, my dear, subtract 31 from the current year and there you have it. Now go on and enjoy being in your thirties, you spring chicken!
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If you are currently 31 years old, you were born in the year 1990. This is determined by subtracting your current age from the current year (2021). So, 2021 - 31 = 1990.
If you have already turned 31 this year you would of been born in 1979, if you are 32 sometime this year then you would of been born in 1978.
If you were born in 1990, and it is currently the year 2021, you would be 31 years old. This calculation is done by subtracting the year of your birth from the current year. So, 2021 (current year) - 1990 (year of birth) = 31 years old.
For any year after 2000, your age on your birthday in that year will be 10 more than the last two digits of the year. Example: on your birthday in 2014, you will be 24. On any date prior to your birthday in a given year, your age will be one year less.
As of September 2011, someone born on December 1, 1979 would be 31 years old.
If it is 2021, and it is before Feb. 14, you are 30 years old. But if it is after Feb. 14, you are 31
If they were born between January 1, 2002 and today's month and day in 2002 they would be 8 years old, but if they were born between today's month and day in 2002 and December 31, 2002 they would be 7 years old.