I don't mean due to advanced medical technology, cryogenics, stasis, time travel, etc.
I don't mean due to being a Q or a Borg or some other non-corporeal lifeform or a totally alien biology.
I don't mean due to advanced medical technology, cryogenics, stasis, time travel, etc.
I don't mean due to being a Q or a Borg or some other non-corporeal lifeform or a totally alien biology.
The Gideons are humanoid and have become immortal as a result of the germ-free state of their homeworld (e.g. through natural evolution).
EL-Aurians have a natural lifespan of at least 700 years (the canonical age of one minor character belonging to said species).
Changelings seem to be biologically immortal, but I doubt that they qualify for the "standard humanoid" category.
The Ba'ku might count, although their longevity is apparently not due to anything inherent about their biology per se, but because
They live on a planet that constantly regenerates them and reverses their aging. This process is shown to also work on Klingons (Worf) and Humans (Geordi), and so presumably would work on many, if not most, other humanoid species.