148 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 148 years old now, what year was he born? See below:

If 148 years old, year of birth is:
1876 or 1877*

*It depends on whether he was born before or after 1 January 1877.

If now 148 years and his year of birth 1876 if he was born after 19 December 1876 until 31 december 1876 inclusively, and his year of birth is 1877 if he was born from 1 January 1877 to 19 December 1877.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 16 years, year of birth 2008 or 2009
If now 25 years, year of birth 1999 or 2000
If now 100 years, year of birth 1924 or 1925

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