If you were born in 1990, then you'll turn 23 on your birthday in 2013.
___________________________________________________________________________________________________________
Currently we are in year 2014. Then you will be 24 years old on celebrating your birthday of year 2014
If you were born in 1990, then you will turn 23 on your brithday in 2013.
You will turn 23 in 2013.
If you were born in the year 1990, then you should be turning/have turned 23 years old in 2013.
1990
1990
The year of birth would have been 1990.
You would be born in 1969.
Given that the year you're looking at is 2010, if you were 20, you would be born in 1990.
If you are 21 in 2013, then you were born in 1992.
You would have been born in 1990.
You would be 27 this year.
You would be born in 1950.