2010 year born – age now in 2022?

How old am I in 2022 if I was born in 2010? Today's date is - 3 December 2022.

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

*Depends on before or after 3 December 2010 year he was born.

If a person was born from January 1 2010 to 3 December 2010 inclusively, he is 12 years old now, otherwise, if after 3 December 2010 (until December 31 2010 inclusively), then he is still 11 years old now.

Other examples:

If 1909 year of birth - already 113 years or still 112 years.
If 1967 year of birth - already 55 years or still 54 years.
If 1985 year of birth - already 37 years or still 36 years.
If 2006 year of birth - already 16 years or still 15 years.

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