One side of my smile droops down, how do I fix it? (photos)

My mouth has always been a little asymmetrical, most noticeable when smirking. The side of my face that droops more is also the side with a weaker jaw line. I have been considering getting fillers to make my jaw line more defined and symmetrical, especially in the mandible area because my jaw is very weak looking. Also considering cheek filler to even out my fat-heavy lower face. Would this help with the mouth asymmetry? Or is this too much filler for a 22 year old and would make me age?