1999 year born – age now in 2023?

How old am I in 2023 if I was born in 1999? Today's date is - 10 June 2023.

If year of birth - 1999, he is now:
23 years old or 24 years old*

*Depends on before or after 10 June 1999 year he was born.

If a person was born from January 1 1999 to 10 June 1999 inclusively, he is 24 years old now, otherwise, if after 10 June 1999 (until December 31 1999 inclusively), then he is still 23 years old now.

Other examples:

If 1917 year of birth - already 106 years or still 105 years.
If 1969 year of birth - already 54 years or still 53 years.
If 1978 year of birth - already 45 years or still 44 years.
If 2019 year of birth - already 4 years or still 3 years.

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