70 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 70 years old now, what year was he born? See below:

If 70 years old, year of birth is:
1954 or 1955*

*It depends on whether he was born before or after 1 January 1955.

If now 70 years and his year of birth 1954 if he was born after 19 December 1954 until 31 december 1954 inclusively, and his year of birth is 1955 if he was born from 1 January 1955 to 19 December 1955.

Other examples:

If now 12 years, year of birth 2012 or 2013
If now 13 years, year of birth 2011 or 2012
If now 30 years, year of birth 1994 or 1995
If now 98 years, year of birth 1926 or 1927

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