2017 year born – age now in 2021?

How old am I in 2021 if I was born in 2017? Today's date is - 23 October 2021.


If year of birth - 2017, he is now:
3 years old or 4 years old*
*Depends on before or after 23 October 2017 year he was born.


If a person was born from January 1 2017 to 23 October 2017 inclusively, he is 4 years old now, otherwise, if after 23 October 2017 (until December 31 2017 inclusively), then he is still 3 years old now.


Other examples:

If 1912 year of birth - already 109 years or still 108 years.
If 1969 year of birth - already 52 years or still 51 years.
If 1978 year of birth - already 43 years or still 42 years.
If 2018 year of birth - already 3 years or still 2 years.

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