I'm a 62 yr-old male. For over 6 years of blood works, my TSH (3rd Gen) number has consistently been <0.01 L. My other blood work numbers are typically good--glucose, cholesterol, et cetera.
Several times over these years my doctor has noted this low TSH number and asked, "Do you feel tired?" I have responded, "Yes, I feel like I have chronic fatigue." I am active, a recreational cyclist, but with a life outside of this. He only knows that I ride a bike.