When someone says that Mary and Christ had ‘perfect human nature’ - does this mean that they were not subject to death? For the wages of sin is death? I’m just confused. Sorry.
I didn’t answer these questions in my other post, so I’m adding this one. No need to apologize – it can be confusing

Yes, since Mary and Jesus had perfect human natures, they were not subject to death. Jesus *chose *to die --He didn’t die as a natural consequence of original sin. With Mary, the Church is silent on whether or not she died, but the consensus has been that she, too, *chose *to die in imitation of her Son, but as a Catholic you are not required to believe that. Some believe she didn’t die before being assumed into heaven. If Adam and Eve had never sinned, they, too, would not have suffered physical death, either.
One explanation I’ve heard is that Christ’s nature, though subject to the temporal punishments of Adam’s sin in his body, was not subject to the corruption of the human soul. Is this correct???
Are you referring to the original punishment God inflicted upon Adam – that he would have to work with hard physical labor in order to till the earth? Jesus would have been subject to that, because that would be external to His nature – fallen creation–but He wouldn’t have suffered illness and death, since those are the result of original sin. And His human soul would not be subject to corruption, either, which is another consequence of original sin.