6 years old now in 2025 - what year born?

Today, 22 April 2025 if a person is 6 years old now, what year was he born? See below:

If 6 years old, year of birth is:
2018 or 2019*

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

If now 6 years and his year of birth 2018 if he was born after 22 April 2018 until 31 december 2018 inclusively, and his year of birth is 2019 if he was born from 1 January 2019 to 22 April 2019.

Other examples:

If now 5 years, year of birth 2019 or 2020
If now 12 years, year of birth 2012 or 2013
If now 29 years, year of birth 1995 or 1996
If now 93 years, year of birth 1931 or 1932

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