at what age, you started spending your time as a sedentary nerd? I have a theory. I have been similar to you until last year. Then I started exercising, lifting weights, fixed my posture. Then I had to take a break because of life's circumstances, and I got all the ailments and pains people have been complaining about the sedentary lifestyle; back pain and all that.

It is possible, those of us who have been nerds from an early age develop with body skeleto-muscular structure that is more forgiving to this lifestyle.