50 years old now in 2023 - what year born?

Today, 6 December 2023 if a person is 50 years old now, what year was he born? See below:

If 50 years old, year of birth is:
1972 or 1973*

*It depends on whether he was born before or after 1 January 1973.

If now 50 years and his year of birth 1972 if he was born after 6 December 1972 until 31 december 1972 inclusively, and his year of birth is 1973 if he was born from 1 January 1973 to 6 December 1973.

Other examples:

If now 8 years, year of birth 2014 or 2015
If now 15 years, year of birth 2007 or 2008
If now 23 years, year of birth 1999 or 2000
If now 37 years, year of birth 1985 or 1986

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