1971 year born – age now in 2022?

How old am I in 2022 if I was born in 1971? Today's date is - 27 September 2022.

If year of birth - 1971, he is now:
50 years old or 51 years old*

*Depends on before or after 27 September 1971 year he was born.

If a person was born from January 1 1971 to 27 September 1971 inclusively, he is 51 year old now, otherwise, if after 27 September 1971 (until December 31 1971 inclusively), then he is still 50 years old now.

Other examples:

If 1901 year of birth - already 121 years or still 120 years.
If 1969 year of birth - already 53 years or still 52 years.
If 1991 year of birth - already 31 years or still 30 years.
If 2017 year of birth - already 5 years or still 4 years.

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