Is it normal to have a growth spurt at 24 years of age?

I started having a lot of pain in my ligaments, muscles, and bones after I had some sort of viral infection. This pain was on going for a long time so I went to see the doctor who did some blood tests. The results were that I had a ridiculously high number of normal red blood cells and a high ESR (erythrocyte sedimentation rate, which measures inflammation). All my hormone levels were normal, with the exception of an extremely high level of testosterone and DHT. No I do not do steroids. Despite my not eating almost at all I my muscles started to grow like crazy (I have stretch marks from growth and increased weight gain). My bodyfat has gone down to extremely low levels (almost dangerously). I also started to grow again which was confirmed each visit by my doctor who is baffled at what is happening (I have grown over 1 inch in 3 months. I have to do more blood tests now. They have ruled out anything systemic and they have also ruled out cancer of the pituitary gland, thyroid or any other cancer.What could this be?