2020 year born – age now in 2025?

How old am I in 2025 if I was born in 2020? Today's date is - 19 December 2025.

If year of birth - 2020, he is now:
4 years old or 5 years old*

*Depends on before or after 19 December 2020 year he was born.

If a person was born from January 1 2020 to 19 December 2020 inclusively, he is 5 years old now, otherwise, if after 19 December 2020 (until December 31 2020 inclusively), then he is still 4 years old now.

Other examples:

If 1947 year of birth - already 78 years or still 77 years.
If 1969 year of birth - already 56 years or still 55 years.
If 1985 year of birth - already 40 years or still 39 years.
If 2013 year of birth - already 12 years or still 11 years.

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