45 years old now in 2023 - what year born?

Today, 26 September 2023 if a person is 45 years old now, what year was he born? See below:

If 45 years old, year of birth is:
1977 or 1978*

*It depends on whether he was born before or after 1 January 1978.

If now 45 years and his year of birth 1977 if he was born after 26 September 1977 until 31 december 1977 inclusively, and his year of birth is 1978 if he was born from 1 January 1978 to 26 September 1978.

Other examples:

If now 12 years, year of birth 2010 or 2011
If now 13 years, year of birth 2009 or 2010
If now 19 years, year of birth 2003 or 2004
If now 44 years, year of birth 1978 or 1979

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