39m here. Low bodyfat, bodybuilding 5x/week for 3yrs after a 2 decade hiatus. Decided to get tested after not seeing the results I got in my early 20's (I wish!).
Total test: 506 ng/dl.
Free testosterone: 18.4 pg/ml.
This seems like quite a low % free. Neglected to add SHBG to the test...