When are the hairs in the head truly dead?

We generally think that people who have developed advanced balding and the skin has become ‘atrophic’ which means very thin with no fat (almost tissue paper thin) for many years, that the hairs that were originally there are no longer alive. We believe that the stem cells that produced hairs have died off in these people. But if you are under 35, you may not be in this category. The presence of miniaturization is very hopeful with the right medication and possibly new medications on the horizon