121 years old now in 2024 - what year born?

Today, 4 December 2024 if a person is 121 years old now, what year was he born? See below:

If 121 years old, year of birth is:
1902 or 1903*

*It depends on whether he was born before or after 1 January 1903.

If now 121 years and his year of birth 1902 if he was born after 4 December 1902 until 31 december 1902 inclusively, and his year of birth is 1903 if he was born from 1 January 1903 to 4 December 1903.

Other examples:

If now 3 years, year of birth 2020 or 2021
If now 12 years, year of birth 2011 or 2012
If now 23 years, year of birth 2000 or 2001
If now 79 years, year of birth 1944 or 1945

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