146 years old now in 2021 - what year born?

Today, 27 January 2021 if a person is 146 years old now, what year was he born? See below:

If 146 years old, year of birth is:
1874 or 1875*

*It depends on whether he was born before or after 1 January 1875.

If now 146 years and his year of birth 1874 if he was born after 27 January 1874 until 31 december 1874 inclusively, and his year of birth is 1875 if he was born from 1 January 1875 to 27 January 1875.

Other examples:

If now 10 years, year of birth 2010 or 2011
If now 18 years, year of birth 2002 or 2003
If now 29 years, year of birth 1991 or 1992
If now 70 years, year of birth 1950 or 1951

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