122 years old now in 2025 - what year born?

Today, 24 April 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 24 April 1902 until 31 december 1902 inclusively, and his year of birth is 1903 if he was born from 1 January 1903 to 24 April 1903.

Other examples:

If now 12 years, year of birth 2012 or 2013
If now 14 years, year of birth 2010 or 2011
If now 18 years, year of birth 2006 or 2007
If now 40 years, year of birth 1984 or 1985

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