2010 year born – age now in 2023?

How old am I in 2023 if I was born in 2010? Today's date is - 27 March 2023.

If year of birth - 2010, he is now:
12 years old or 13 years old*

*Depends on before or after 27 March 2010 year he was born.

If a person was born from January 1 2010 to 27 March 2010 inclusively, he is 13 years old now, otherwise, if after 27 March 2010 (until December 31 2010 inclusively), then he is still 12 years old now.

Other examples:

If 1917 year of birth - already 106 years or still 105 years.
If 1967 year of birth - already 56 years or still 55 years.
If 1982 year of birth - already 41 years or still 40 years.
If 2005 year of birth - already 18 years or still 17 years.

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