It is common knowledge that sperm cells regenerate, while eggs do not. Sperm cells are created through mitosis originating from diploid spermatogonium cells.
However, the science on the creating of these spermatogonium cells is less clear. They come from "primordial germ cells" which are the same cells that turn into nonrenewable eggs in female fetuses.
Are these primordial germ cells affected by atrophy? Or are they able to indefinitely create spermatogonium only using nutrients from the body or something? The science is very unclear here.