7 years old now in 2025 - what year born?

Today, 16 June 2025 if a person is 7 years old now, what year was he born? See below:

If 7 years old, year of birth is:
2017 or 2018*

*It depends on whether he was born before or after 1 January 2018.

If now 7 years and his year of birth 2017 if he was born after 16 June 2017 until 31 december 2017 inclusively, and his year of birth is 2018 if he was born from 1 January 2018 to 16 June 2018.

Other examples:

If now 8 years, year of birth 2016 or 2017
If now 14 years, year of birth 2010 or 2011
If now 23 years, year of birth 2001 or 2002
If now 70 years, year of birth 1954 or 1955

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