2009 year born – age now in 2024?

How old am I in 2024 if I was born in 2009? Today's date is - 11 December 2024.

If year of birth - 2009, he is now:
14 years old or 15 years old*

*Depends on before or after 11 December 2009 year he was born.

If a person was born from January 1 2009 to 11 December 2009 inclusively, he is 15 years old now, otherwise, if after 11 December 2009 (until December 31 2009 inclusively), then he is still 14 years old now.

Other examples:

If 1916 year of birth - already 108 years or still 107 years.
If 1954 year of birth - already 70 years or still 69 years.
If 1985 year of birth - already 39 years or still 38 years.
If 2022 year of birth - already 2 years or still 1 years.

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