149 years old now in 2024 - what year born?

Today, 11 December 2024 if a person is 149 years old now, what year was he born? See below:

If 149 years old, year of birth is:
1874 or 1875*

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

If now 149 years and his year of birth 1874 if he was born after 11 December 1874 until 31 december 1874 inclusively, and his year of birth is 1875 if he was born from 1 January 1875 to 11 December 1875.

Other examples:

If now 3 years, year of birth 2020 or 2021
If now 18 years, year of birth 2005 or 2006
If now 24 years, year of birth 1999 or 2000
If now 74 years, year of birth 1949 or 1950

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