IS IT A CAUSE OF AGING PROBLEMS OR A MARKER? A Single Hormone in Men May Predict Their Future Health. “That hormone is INSL3, and it first appears during puberty. From then on, its levels only dip slightly in old age. This consistency and the early age at which it appears makes INSL3 valuable to scientists – and possibly men’s health. Someone with lower INSL3 levels at a young age is probably going to have lower levels of the hormone in old age too, the new research shows. If that translates to a greater risk of health complications, as the study suggests may be the case, those health risks could potentially be managed many years earlier.”