[ Penny has some ideas for that herself, having been privy to her father's own debates and considerations with regards to improving her durability, and she makes a note to share them with Viktor later. For now, he's presented her with an interesting philosophical sort of question. ]

That's unknown. I'm the first example of an Aura sustaining itself with an inorganic host and I was only made several years ago. However, as a person ages their Aura typically does not grow weaker. Even someone very elderly can have an Aura stronger than someone in their prime.