51 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 51 years old now, what year was he born? See below:

If 51 years old, year of birth is:
1974 or 1975*

*It depends on whether he was born before or after 1 January 1975.

If now 51 years and his year of birth 1974 if he was born after 28 October 1974 until 31 december 1974 inclusively, and his year of birth is 1975 if he was born from 1 January 1975 to 28 October 1975.

Other examples:

If now 4 years, year of birth 2021 or 2022
If now 14 years, year of birth 2011 or 2012
If now 21 years, year of birth 2004 or 2005
If now 98 years, year of birth 1927 or 1928

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