Isn't it always better to get more fillers as you get older?

I am starting to notice some of the sunken areas on my face more than before, but when I actually think about getting fillers, I am hesitant because I'm worried my face might look different.

I heard that especially after middle age, it is more important to consider the overall balance of the face rather than simply adding volume.

I would like to know if age or skin sagging is also taken into consideration when determining the amount of filler.