1917 year born – age now in 2023?

How old am I in 2023 if I was born in 1917? Today's date is - 31 January 2023.

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

*Depends on before or after 31 January 1917 year he was born.

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

Other examples:

If 1947 year of birth - already 76 years or still 75 years.
If 1973 year of birth - already 50 years or still 49 years.
If 1984 year of birth - already 39 years or still 38 years.
If 2010 year of birth - already 13 years or still 12 years.

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