2012 year born – age now in 2023?

How old am I in 2023 if I was born in 2012? Today's date is - 22 March 2023.

If year of birth - 2012, he is now:
10 years old or 11 years old*

*Depends on before or after 22 March 2012 year he was born.

If a person was born from January 1 2012 to 22 March 2012 inclusively, he is 11 years old now, otherwise, if after 22 March 2012 (until December 31 2012 inclusively), then he is still 10 years old now.

Other examples:

If 1908 year of birth - already 115 years or still 114 years.
If 1965 year of birth - already 58 years or still 57 years.
If 1993 year of birth - already 30 years or still 29 years.
If 2013 year of birth - already 10 years or still 9 years.

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