You had me up until the yellow sweater part!
I'm sure that part of it is diminished testosterone. I don't have as much drive for some other things too.
Sometimes it's the little stuff. For instance, my shop is well lit with bright white walls to help make the dark, cloudy Oregon winter a little less...dark. My point is try something and you will be sure to find something that helps.
Your testosterone is just a number. Do you consume energy drinks? How is your diet? Do you eat enough greens etc. Eating habits weigh in heavily on your overall well being. The other thing that should be avoided, as you know, is becoming sedentary in your free time.
