145 years old now in 2024 - what year born?

Today, 15 September 2024 if a person is 145 years old now, what year was he born? See below:

If 145 years old, year of birth is:
1878 or 1879*

*It depends on whether he was born before or after 1 January 1879.

If now 145 years and his year of birth 1878 if he was born after 15 September 1878 until 31 december 1878 inclusively, and his year of birth is 1879 if he was born from 1 January 1879 to 15 September 1879.

Other examples:

If now 9 years, year of birth 2014 or 2015
If now 12 years, year of birth 2011 or 2012
If now 20 years, year of birth 2003 or 2004
If now 40 years, year of birth 1983 or 1984

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