From today on I'll take .5 mg, and get blood work in 4 weeks. testosterone replacement therapy (TRT)? I don't know, I'm only 19 years old. I'm fully grown though, high estrogen levels speed up your growth. I just looked up Kleinfelter's syndrome and I don't think I have it. I am very, very hairy. I do have muscles, but not that much. My hips and shoulders are about the same, maybe my shoulders are a little wider. I don't have long legs either. As far as cognitive functions, I'm pretty okay. I do have ADD though.