2013 year born – age now in 2023?

How old am I in 2023 if I was born in 2013? Today's date is - 7 December 2023.

If year of birth - 2013, he is now:
9 years old or 10 years old*

*Depends on before or after 7 December 2013 year he was born.

If a person was born from January 1 2013 to 7 December 2013 inclusively, he is 10 years old now, otherwise, if after 7 December 2013 (until December 31 2013 inclusively), then he is still 9 years old now.

Other examples:

If 1928 year of birth - already 95 years or still 94 years.
If 1966 year of birth - already 57 years or still 56 years.
If 1992 year of birth - already 31 years or still 30 years.
If 2007 year of birth - already 16 years or still 15 years.

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