123 years old now in 2025 - what year born?

Today, 22 April 2025 if a person is 123 years old now, what year was he born? See below:

If 123 years old, year of birth is:
1901 or 1902*

*It depends on whether he was born before or after 1 January 1902.

If now 123 years and his year of birth 1901 if he was born after 22 April 1901 until 31 december 1901 inclusively, and his year of birth is 1902 if he was born from 1 January 1902 to 22 April 1902.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 15 years, year of birth 2009 or 2010
If now 30 years, year of birth 1994 or 1995
If now 47 years, year of birth 1977 or 1978

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