Medical upgrades were always improving, never steadily, but with convulsive organic jumps. Any blue-chip upgrade licensed in the 2090s would be (very roughly speaking) about twice as effective as the best available in the 2080s. There had been limit-shattering paradigmatic breakthroughs in life extension during the 2060s and 2070s. As for the 2050s, the stunts they’d been calling "medicine" back then (which had seemed tremendously impressive at the time) scarcely qualified as life extension at all, by modern standards. The medical techniques of the 2050s barely qualified as common hygienic procedures. They were even cheap.