1917 year born – age now in 2023?

How old am I in 2023 if I was born in 1917? Today's date is - 1 December 2023.

If year of birth - 1917, he is now:
105 years old or 106 years old*

*Depends on before or after 1 December 1917 year he was born.

If a person was born from January 1 1917 to 1 December 1917 inclusively, he is 106 years old now, otherwise, if after 1 December 1917 (until December 31 1917 inclusively), then he is still 105 years old now.

Other examples:

If 1932 year of birth - already 91 years or still 90 years.
If 1952 year of birth - already 71 years or still 70 years.
If 1987 year of birth - already 36 years or still 35 years.
If 2012 year of birth - already 11 years or still 10 years.

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