49 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 49 years old now, what year was he born? See below:

If 49 years old, year of birth is:
1974 or 1975*

*It depends on whether he was born before or after 1 January 1975.

If now 49 years and his year of birth 1974 if he was born after 15 October 1974 until 31 december 1974 inclusively, and his year of birth is 1975 if he was born from 1 January 1975 to 15 October 1975.

Other examples:

If now 6 years, year of birth 2017 or 2018
If now 14 years, year of birth 2009 or 2010
If now 24 years, year of birth 1999 or 2000
If now 46 years, year of birth 1977 or 1978

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