can think of it like: the cost of this body system and hormones over a lifetime. as in: you can buy a new phone and keep it in a box. you can buy a new phone and use it. batteries do not have eternal longevity. to use it, to run it into the ground, well as it is run in, certain thresholds are crossed, the battery fails in a specific way do to use and age. that is prostate cancer for men in the current conception of understanding on the topic.