Surely restoring a skilled 58-year-old with decades of experience to full health is much faster and cheaper than making an entirely new human and training them

Surely restoring a skilled 58-year-old with decades of experience to full health is much faster and cheaper than making an entirely new human and training them to the same level. As for preventing people getting sick—well, from what I've heard, a significant reason older people are more likely to get cancer is that their immune system and their body's ability to repair itself are weaker (and one part of cancer is DNA damage), so it seems like the most likely approaches to preventing cancer are also going to help with curing other illnesses.