5 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 5 years old now, what year was he born? See below:

If 5 years old, year of birth is:
2018 or 2019*

*It depends on whether he was born before or after 1 January 2019.

If now 5 years and his year of birth 2018 if he was born after 15 October 2018 until 31 december 2018 inclusively, and his year of birth is 2019 if he was born from 1 January 2019 to 15 October 2019.

Other examples:

If now 12 years, year of birth 2011 or 2012
If now 16 years, year of birth 2007 or 2008
If now 22 years, year of birth 2001 or 2002
If now 61 years, year of birth 1962 or 1963

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