To determine your age from 1990 to 2013, you would subtract your birth year from the current year. For example, in 1990, you would be your birth year age. In 2013, you would be your birth year age plus 23. So, for each year between 1990 and 2013, you would increment your age by one year.
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If you were born in the year 1990, then you should be turning/have turned 23 years old in 2013.
You will be 23 in 2013. How old I am is none of your business.
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
21
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.
If you are 21 years old, you were born in 1990. (2011)