62 years old now in 2023 - what year born?

Today, 23 September 2023 if a person is 62 years old now, what year was he born? See below:

If 62 years old, year of birth is:
1960 or 1961*

*It depends on whether he was born before or after 1 January 1961.

If now 62 years and his year of birth 1960 if he was born after 23 September 1960 until 31 december 1960 inclusively, and his year of birth is 1961 if he was born from 1 January 1961 to 23 September 1961.

Other examples:

If now 12 years, year of birth 2010 or 2011
If now 12 years, year of birth 2010 or 2011
If now 20 years, year of birth 2002 or 2003
If now 100 years, year of birth 1922 or 1923

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