How do you think one year old should be explained (is it one year old or birthday)?

That's right. I think you may know better:

If your birthday is 1984 April 14, then it is 2006, which means that you have entered the imaginary age of 22. The reason is that you turned 2 1 year old last year, that is, April 6, 2005, and entered the 22-year-old nominal age (since 2005,