127 years old now in 2025 - what year born?

Today, 21 May 2025 if a person is 127 years old now, what year was he born? See below:

If 127 years old, year of birth is:
1897 or 1898*

*It depends on whether he was born before or after 1 January 1898.

If now 127 years and his year of birth 1897 if he was born after 21 May 1897 until 31 december 1897 inclusively, and his year of birth is 1898 if he was born from 1 January 1898 to 21 May 1898.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 12 years, year of birth 2012 or 2013
If now 29 years, year of birth 1995 or 1996
If now 46 years, year of birth 1978 or 1979

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