I am a 21 year old female. From what i have researched the ideal philtrum to chin ratio is 1:2 and from what i have measured my ratio is approx. 1.6:2. my philtrum is approx. 15mm and my chin is approx. 25mm. Not sure if it's 100% accurate but I tried my best. Also, it seems to me that I have a receeding chin that would have to be fixed possibly before the lip lift.