1921 year born – age now in 2022?

How old am I in 2022 if I was born in 1921? Today's date is - 6 December 2022.

If year of birth - 1921, he is now:
100 years old or 101 years old*

*Depends on before or after 6 December 1921 year he was born.

If a person was born from January 1 1921 to 6 December 1921 inclusively, he is 101 year old now, otherwise, if after 6 December 1921 (until December 31 1921 inclusively), then he is still 100 years old now.

Other examples:

If 1936 year of birth - already 86 years or still 85 years.
If 1963 year of birth - already 59 years or still 58 years.
If 1993 year of birth - already 29 years or still 28 years.
If 1997 year of birth - already 25 years or still 24 years.

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