The Med-Pod doesn't cure aging.
It cures trauma—and biological aging isn't a parts problem, it's an information problem.
Watch the scene where Frey's daughter is brought inside: the machine scans, identifies the leukemia as a discrete malfunction, and erases it in seconds. Blomkamp built a device that thinks of the human body the way a mechanic thinks of a car—locate the broken part, rebuild it, send it back out.
By 2154, the wealthy on Elysium have access to something better than cure technology — they have the option not to accumulate damage in the first place. The Med-Pod appears twice for them as routine maintenance, preventive care, the luxury of fixing things before they break catastrophically. Meanwhile, the poor on Earth get the Med-Pod only as emergency room, a last resort when the system fails completely.
The Med-Pod's fantasy is that inequality could be solved by distributing a machine. The actual horror is that inequality was already solved by distributing time itself.
Watch the 47-minute mark where Frey first enters Elysium's med-facility, then compare it to any scene of Earth healthcare in the film—note which one shows *preventive* use versus emergency response, and ask yourself which one your insurance covers.
Find the 2013 io9 interview where Blomkamp discusses the Med-Pod's design as 'a solution to inequality'—his language reveals he never questioned whether a machine could solve a distribution problem.