I see you haven’t read Perry Rhodan. Plenty of “relative immortals” there, the standard immortality offered in the series is the stop-aging immortality, being immune to most diseases and some poisons. Some of the protagonists are 15,000 year old, though most (surviving) immortals started at 1980 and are at most 3,200 years old at the current in-story time. And quite a few younger ones, in their early 1,500. Not a lot of “being immortal sucks” angst, there.
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