Testosterone is important in the development of bones, as I described earlier, nonetheless it is also vital for the preservation of bone density, especially in the elderly.
Testosterone supports protein synthesis, efficiently helping repair muscle fibers with proteins. It can sustain existing size or build upon it, producing more.
So, testosterone is important, and perhaps crucial, if you want to create (and maintain) solid bones and muscles, sustain a healthful, lively sex life, and live long and well into later years. But, how do we make sure that our body's make the required amount?