75 years old now in 2023 - what year born?

Today, 1 December 2023 if a person is 75 years old now, what year was he born? See below:

If 75 years old, year of birth is:
1947 or 1948*

*It depends on whether he was born before or after 1 January 1948.

If now 75 years and his year of birth 1947 if he was born after 1 December 1947 until 31 december 1947 inclusively, and his year of birth is 1948 if he was born from 1 January 1948 to 1 December 1948.

Other examples:

If now 12 years, year of birth 2010 or 2011
If now 15 years, year of birth 2007 or 2008
If now 20 years, year of birth 2002 or 2003
If now 88 years, year of birth 1934 or 1935

HTML code:

BB code: