122 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 122 years old now, what year was he born? See below:

If 122 years old, year of birth is:
1902 or 1903*

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

If now 122 years and his year of birth 1902 if he was born after 19 December 1902 until 31 december 1902 inclusively, and his year of birth is 1903 if he was born from 1 January 1903 to 19 December 1903.

Other examples:

If now 12 years, year of birth 2012 or 2013
If now 16 years, year of birth 2008 or 2009
If now 22 years, year of birth 2002 or 2003
If now 44 years, year of birth 1980 or 1981

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