145 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 145 years old now, what year was he born? See below:

If 145 years old, year of birth is:
1879 or 1880*

*It depends on whether he was born before or after 1 January 1880.

If now 145 years and his year of birth 1879 if he was born after 19 December 1879 until 31 december 1879 inclusively, and his year of birth is 1880 if he was born from 1 January 1880 to 19 December 1880.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 17 years, year of birth 2007 or 2008
If now 24 years, year of birth 2000 or 2001
If now 90 years, year of birth 1934 or 1935

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