I am a 63 year old male. I recently got my test result for testosterone, it was 343. The normal range is 250 to 850. I seem to be t the lower end of what is normal, and I do have erection problems, as well as a low desire for sex. I m fatigued most of the time, but tht could be for a lack of exercise, etc. Is this a normal range for a person my age?