2013 year born – age now in 2023?

How old am I in 2023 if I was born in 2013? Today's date is - 5 June 2023.

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

*Depends on before or after 5 June 2013 year he was born.

If a person was born from January 1 2013 to 5 June 2013 inclusively, he is 10 years old now, otherwise, if after 5 June 2013 (until December 31 2013 inclusively), then he is still 9 years old now.

Other examples:

If 1902 year of birth - already 121 years or still 120 years.
If 1970 year of birth - already 53 years or still 52 years.
If 1986 year of birth - already 37 years or still 36 years.
If 2017 year of birth - already 6 years or still 5 years.

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