Is the eight-character change based on imaginary age or real age?

There is no special regulation on whether the change of the eight characters is based on the nominal age or the real age. This is a man-made decision. The results of using the eight-character dish arrangement software, some seek good luck according to the imaginary year, and some seek good luck according to the real year. According to my personal habits, I use a real-life version of the finishing software.