149 years old now in 2023 - what year born?

Today, 26 March 2023 if a person is 149 years old now, what year was he born? See below:

If 149 years old, year of birth is:
1873 or 1874*

*It depends on whether he was born before or after 1 January 1874.

If now 149 years and his year of birth 1873 if he was born after 26 March 1873 until 31 december 1873 inclusively, and his year of birth is 1874 if he was born from 1 January 1874 to 26 March 1874.

Other examples:

If now 5 years, year of birth 2017 or 2018
If now 18 years, year of birth 2004 or 2005
If now 18 years, year of birth 2004 or 2005
If now 88 years, year of birth 1934 or 1935

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