Hi, it's a bad idea because at 20 years old the face wouldn't have "jowls". Jowls are sagging facial tissues that are the primary indication for any form of a facelift. That doesn't mean that your face can't be aesthetically improved through the various techniques that can be used for facial shaping. In any case, non smiling photos of your face from the front and side would help in the evaluation. I have performed many facial shaping procedures using dermal fillers, silastic facial implants (cheek, chin), liposuction and/or facelifts for over 30 years. Following my beauty principles, women look the most feminine, youthful and attractive with heart shaped faces. Heart shaped faces have cheeks that are full and round in the front. if the cheeks are flat or concave in the front, cheek augmentation with a dermal filler or using cheek implants for a permanent enhancement will create full, round cheeks that will feminize the entire face. If excess fat exists (called "baby fat" in a 20 year old which typically reduces by itself by the mid to late twenties), this can be reduced with liposuction to further shape the cheeks and face. When the chin is weak, this creates an imbalance making the nose appear larger, the mid face top heavy and the lower face look short that de-emphasizes the lips and allows early formation of a double chin. Chin augmentation using a chin implant will add projection to the chin creating harmony and balance to the lower face. I have found that placement of a silastic chin implant, through a small curved incision under the chin (also allows excess skin removal) to be very safe, quick, highly effective and far less invasive than a sliding genioplasty. I perform chin implant surgery in 30 minutes or less, often using a local anesthetic alone. In my opinion, you are a good candidate for chin implant surgery. Similarly, if the back portion of your jaw line is a bit weak this can be augmented, without making your face appear masculine, using precise placement of a dermal filler (I prefer using Restylane Lyft). Finally, if the lips are thin or do not have the ideal aesthetic promotion, they can be augmented with a dermal filler or lip implants. So, as you can see there are many things available to improve the appearance of a 20 year old without performing a facelift. Hope this helps.