2015 year born – age now in 2023?

How old am I in 2023 if I was born in 2015? Today's date is - 26 March 2023.

If year of birth - 2015, he is now:
7 years old or 8 years old*

*Depends on before or after 26 March 2015 year he was born.

If a person was born from January 1 2015 to 26 March 2015 inclusively, he is 8 years old now, otherwise, if after 26 March 2015 (until December 31 2015 inclusively), then he is still 7 years old now.

Other examples:

If 1922 year of birth - already 101 years or still 100 years.
If 1951 year of birth - already 72 years or still 71 years.
If 1983 year of birth - already 40 years or still 39 years.
If 2009 year of birth - already 14 years or still 13 years.

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