2015 year born – age now in 2025?

How old am I in 2025 if I was born in 2015? Today's date is - 22 April 2025.

If year of birth - 2015, he is now:
9 years old or 10 years old*

*Depends on before or after 22 April 2015 year he was born.

If a person was born from January 1 2015 to 22 April 2015 inclusively, he is 10 years old now, otherwise, if after 22 April 2015 (until December 31 2015 inclusively), then he is still 9 years old now.

Other examples:

If 1942 year of birth - already 83 years or still 82 years.
If 1957 year of birth - already 68 years or still 67 years.
If 1992 year of birth - already 33 years or still 32 years.
If 2020 year of birth - already 5 years or still 4 years.

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