I'm 43 and had no saging skin on my knees after I did Ulthera about 4 years ago. I wanted to repeat the treatment to maintain the look but my PA in NYC talked me into doing Fractora because it was less painful. What a stupid mistake I made by listening to her. My knees look awful now. Totally wrinkled and suffered massive loss of fat in the treated area. Ugh. Don't do fractora.