There has been a lot of talk here recently and over time about testosterone and what happens when a guy's testosterone levels are low. One of the warning signs of low testosterone is having low energy levels.

My question is: if low testosterone causes low energy, why don't girls generally have low energy? Their testosterone levels are very low compared to guys. For that matter, why don't small children have low energy levels? Their testosterone levels are lowest of all.

I have searched and I can't find the answer to this anywhere.