Testosterone Levels

Patient : I am 25 and had some concerns about symptoms I have been having. I did some research and thought I should have my testosterone tested . Went to my doctor talked he had my blood tested. He called me saying everything is normal I asked what my numbers were. He told me 239 for total testosterone. I told him what I read that's low he said they use the range. 179-756. Everything I have read that's lower then the average 70 year old. Am I wrong? Just would like some insight. Is there anyway the way they test blood vary to others to result in different numbers ?
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