2005 year born – age now in 2023?

How old am I in 2023 if I was born in 2005? Today's date is - 27 March 2023.

If year of birth - 2005, he is now:
17 years old or 18 years old*

*Depends on before or after 27 March 2005 year he was born.

If a person was born from January 1 2005 to 27 March 2005 inclusively, he is 18 years old now, otherwise, if after 27 March 2005 (until December 31 2005 inclusively), then he is still 17 years old now.

Other examples:

If 1936 year of birth - already 87 years or still 86 years.
If 1962 year of birth - already 61 years or still 60 years.
If 1986 year of birth - already 37 years or still 36 years.
If 2010 year of birth - already 13 years or still 12 years.

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