2012 year born – age now in 2025?

How old am I in 2025 if I was born in 2012? Today's date is - 23 January 2025.

If year of birth - 2012, he is now:
12 years old or 13 years old*

*Depends on before or after 23 January 2012 year he was born.

If a person was born from January 1 2012 to 23 January 2012 inclusively, he is 13 years old now, otherwise, if after 23 January 2012 (until December 31 2012 inclusively), then he is still 12 years old now.

Other examples:

If 1937 year of birth - already 88 years or still 87 years.
If 1959 year of birth - already 66 years or still 65 years.
If 1987 year of birth - already 38 years or still 37 years.
If 2009 year of birth - already 16 years or still 15 years.

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