Theo skips sleep pretty often, so when he does actually sleep he tends to sleep for a while. Kaede will probably wake up before he does.
"You can... resurrect someone who died of old age... but they'll die immediately. You can't heal those kinds of wounds."
"Well that's inconvenient," says Theo. "Theoretical limit or is this probably a mana thing?"
"Theoretical limit of the current healing spells. They don't recognise ageing as damage."
"I don't. And given Sin it's—not exactly been a priority for the past thousand years."
"The incentives are kinda perverse, yeah? If people live too long there are too many of them and Sin kills everyone."
"The incentives for this whole thing are perverse. 'Don't do technology, that's bad, it's a literal sin and you're gonna be squished for it.'"
"Don't alter the landscape too much. Don't overreach. Stay in this nice little box made for you, never leave it, sacrifice a summoner every few years so purchase a temporary peace in hopes that someday humanity will atone for unknown sins."
"Wakka, it is. Have you never thought how convenient it all is, that the exact same institution that happens to control all of Spira—"
Fiends!
Theo will continue to ugh and then after a while ask how much walking (or flying in his case) they expect is necessary between magic spheres, he forgets if he was given a number and has it been long enough do they think.