There is really no ideal age for Emface treatment. It depends on your facial structure and skin condition. Some people can experience signs of facial framework and skin aging at earlier ages than other people. Emface treatment initiated earlier can achieve a desired result potentially with less...
I have seen the emface be effective in raising brows. in that case, there is some elevation of the lids. Though only a temporary fix look into UPNEEQ drops.
Emface and Trilift are muscle stimulating technologies. If you truly have jowls, these technologies do not address the root cause in the aging face and are a waste of time. Regarding energy based devices, I have been unimpressed by results for jowls. It's difficult to give any further...