102 years old now in 2024 - what year born?

Today, 12 September 2024 if a person is 102 years old now, what year was he born? See below:

If 102 years old, year of birth is:
1921 or 1922*

*It depends on whether he was born before or after 1 January 1922.

If now 102 years and his year of birth 1921 if he was born after 12 September 1921 until 31 december 1921 inclusively, and his year of birth is 1922 if he was born from 1 January 1922 to 12 September 1922.

Other examples:

If now 8 years, year of birth 2015 or 2016
If now 12 years, year of birth 2011 or 2012
If now 25 years, year of birth 1998 or 1999
If now 98 years, year of birth 1925 or 1926

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