72 years old now in 2025 - what year born?

Today, 21 May 2025 if a person is 72 years old now, what year was he born? See below:

If 72 years old, year of birth is:
1952 or 1953*

*It depends on whether he was born before or after 1 January 1953.

If now 72 years and his year of birth 1952 if he was born after 21 May 1952 until 31 december 1952 inclusively, and his year of birth is 1953 if he was born from 1 January 1953 to 21 May 1953.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 17 years, year of birth 2007 or 2008
If now 25 years, year of birth 1999 or 2000
If now 53 years, year of birth 1971 or 1972

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