70 years old now in 2024 - what year born?

Today, 15 September 2024 if a person is 70 years old now, what year was he born? See below:

If 70 years old, year of birth is:
1953 or 1954*

*It depends on whether he was born before or after 1 January 1954.

If now 70 years and his year of birth 1953 if he was born after 15 September 1953 until 31 december 1953 inclusively, and his year of birth is 1954 if he was born from 1 January 1954 to 15 September 1954.

Other examples:

If now 12 years, year of birth 2011 or 2012
If now 15 years, year of birth 2008 or 2009
If now 18 years, year of birth 2005 or 2006
If now 67 years, year of birth 1956 or 1957

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