50 years old now in 2025 - what year born?

Today, 24 April 2025 if a person is 50 years old now, what year was he born? See below:

If 50 years old, year of birth is:
1974 or 1975*

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

If now 50 years and his year of birth 1974 if he was born after 24 April 1974 until 31 december 1974 inclusively, and his year of birth is 1975 if he was born from 1 January 1975 to 24 April 1975.

Other examples:

If now 5 years, year of birth 2019 or 2020
If now 15 years, year of birth 2009 or 2010
If now 25 years, year of birth 1999 or 2000
If now 37 years, year of birth 1987 or 1988

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