My Dr. keeps telling me my very low testosterone level of 320ng/dl is normal (I am only 20 years old). He wont belive me that it is LOW so I need to show him some proof, like a chart of testosterone levels by age group. I'd like to get a few of them, especially if its from a well respected lab or organization etc... so he doesnt think it's bs. I found a couple but need a few more to slap in his face, if anyone has one saved or a link to one, I'd really appreciate it. thanks