71 years old now in 2025 - what year born?

Today, 22 April 2025 if a person is 71 years old now, what year was he born? See below:

If 71 years old, year of birth is:
1953 or 1954*

*It depends on whether he was born before or after 1 January 1954.

If now 71 years and his year of birth 1953 if he was born after 22 April 1953 until 31 december 1953 inclusively, and his year of birth is 1954 if he was born from 1 January 1954 to 22 April 1954.

Other examples:

If now 3 years, year of birth 2021 or 2022
If now 13 years, year of birth 2011 or 2012
If now 24 years, year of birth 2000 or 2001
If now 80 years, year of birth 1944 or 1945

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