1900 year born – age now in 2022?

How old am I in 2022 if I was born in 1900? Today's date is - 6 December 2022.

If year of birth - 1900, he is now:
121 years old or 122 years old*

*Depends on before or after 6 December 1900 year he was born.

If a person was born from January 1 1900 to 6 December 1900 inclusively, he is 122 years old now, otherwise, if after 6 December 1900 (until December 31 1900 inclusively), then he is still 121 years old now.

Other examples:

If 1910 year of birth - already 112 years or still 111 years.
If 1972 year of birth - already 50 years or still 49 years.
If 1984 year of birth - already 38 years or still 37 years.
If 2019 year of birth - already 3 years or still 2 years.

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