They can be off their peak and still in normal healthy range.
Indeed, but it also works both ways. You can be within the range and be very deficient. The ranges tend to include large populations of men who are elderly and/or sick and deficient and if you are at the bottom of the range you are just matching them. Not good, or something to think about anyway.
Also, as an aside, but an absolutely critical aside, the important measurement to be looking at is FREE TESTOSTERONE not TOTAL TESTOSTERONE. If you test out at -eg.- 600 on a range of 250-1000, you have no idea whether that is good or bad without looking at the Free T range values. Unless the Testosterone is not bound to something else, it is NOT AVAILABLE . This is not to say that the Total T measurement is without value because you need to see whether you are producing T first and then see why it is or is not ending out at Free T. Could be that is converting to estrogen, could be that it is bound to shbg, etc. But in the end, you need to be seeing you Free T levels in the desired range- NOT TOTAL T.
For a little more on this, I searched up a quick link which covers the basics. Not sayin I agree with everything, because I just did a quick eyeballing. But it starts ya down the road to the proper way to think about it and then you read something else, and pretty soon you are smart.
https://www.artofmanliness.com/2013/01/16/normal-testosterone-levels/
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