138 years old now in 2025 - what year born?

Today, 19 March 2025 if a person is 138 years old now, what year was he born? See below:

If 138 years old, year of birth is:
1886 or 1887*

*It depends on whether he was born before or after 1 January 1887.

If now 138 years and his year of birth 1886 if he was born after 19 March 1886 until 31 december 1886 inclusively, and his year of birth is 1887 if he was born from 1 January 1887 to 19 March 1887.

Other examples:

If now 3 years, year of birth 2021 or 2022
If now 14 years, year of birth 2010 or 2011
If now 19 years, year of birth 2005 or 2006
If now 88 years, year of birth 1936 or 1937

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