134 years old now in 2025 - what year born?

Today, 19 April 2025 if a person is 134 years old now, what year was he born? See below:

If 134 years old, year of birth is:
1890 or 1891*

*It depends on whether he was born before or after 1 January 1891.

If now 134 years and his year of birth 1890 if he was born after 19 April 1890 until 31 december 1890 inclusively, and his year of birth is 1891 if he was born from 1 January 1891 to 19 April 1891.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 18 years, year of birth 2006 or 2007
If now 23 years, year of birth 2001 or 2002
If now 55 years, year of birth 1969 or 1970

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