54 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 54 years old now, what year was he born? See below:

If 54 years old, year of birth is:
1969 or 1970*

*It depends on whether he was born before or after 1 January 1970.

If now 54 years and his year of birth 1969 if he was born after 15 October 1969 until 31 december 1969 inclusively, and his year of birth is 1970 if he was born from 1 January 1970 to 15 October 1970.

Other examples:

If now 12 years, year of birth 2011 or 2012
If now 12 years, year of birth 2011 or 2012
If now 29 years, year of birth 1994 or 1995
If now 36 years, year of birth 1987 or 1988

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