2010 year born – age now in 2023?

How old am I in 2023 if I was born in 2010? Today's date is - 1 December 2023.

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

*Depends on before or after 1 December 2010 year he was born.

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

Other examples:

If 1903 year of birth - already 120 years or still 119 years.
If 1975 year of birth - already 48 years or still 47 years.
If 1987 year of birth - already 36 years or still 35 years.
If 2014 year of birth - already 9 years or still 8 years.

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