*Written by OC Wanderer, author of Destiny Among the Stars, a LitRPG sci-fi series set in the real stellar neighborhood. Published September 16, 2026.*
[Stars give their planets time](https://ocwanderer.com/blog/is-there-a-sweet-spot-age-for-a-star-to-host-a-habitable-planet), sometimes billions of years after a violent youth. I wonder what a survey crew might find around a sun that was already ancient when Earth formed. If a world survived that long with air and water intact, what sort of history could be waiting there?
Some remarkably old stars are close enough to belong on our neighborhood map. HD 140283, Kepler-444 and Kapteyn’s Star all lie within about 190 light-years of the Sun. Our Sun sits in the Orion Spur, but these neighbors include stars from the Galaxy’s older populations passing through our vicinity. Their stories take us from a star whose estimated age once seemed to outrun the Universe itself to five tiny planets and a tempting world that dissolved under a second look.
## A neighbor almost as old as the Universe
Our Sun’s 4.6 billion years sounds ancient until you meet HD 140283, the Methuselah star. This subgiant has used up the hydrogen in its core and begun to swell. Hubble measured its distance at 190 light-years using parallax, the small shift in a star’s apparent position as the telescope moves around the Sun. The resulting age estimate was about 14.5 billion years, with an uncertainty of 0.8 billion—against about 13.8 billion years for the Universe.<sup class="footnote-ref" data-footnote="true" id="fnref-1"><a class="footnote-link" href="#fn-1">1</a></sup> I love the puzzle in that comparison: apparently asking a star its age brought astronomers up against the age of everything.
That uncertainty matters, and later estimates still differ. Modeling with interferometry, which measures the star’s size, gave about 12 billion years;<sup class="footnote-ref" data-footnote="true" id="fnref-2"><a class="footnote-link" href="#fn-2">2</a></sup> modeling its oscillations, the faint flicker associated with sound waves in the star, gave about 14.2 billion.<sup class="footnote-ref" data-footnote="true" id="fnref-3"><a class="footnote-link" href="#fn-3">3</a></sup> Those estimates put it roughly two and a half to just over three times the Sun’s age. Its iron abundance is only about 1/200 of the Sun’s, a chemical trace of an era when earlier stars had barely enriched the gas.<sup class="footnote-ref" data-footnote="true" id="fnref-4"><a class="footnote-link" href="#fn-4">4</a></sup> Suppose a rocky planet formed around a star like this. It could have billions of years more history than Earth, even though we have yet to find such a planet here.
## Kepler-444 had five small worlds long before Earth existed
At Kepler-444, about 117 light-years away in Lyra, the planets are real: five worlds between the sizes of Mercury and Venus. Their star’s oscillations give an age of 11.2 billion years, with roughly a billion years of uncertainty.<sup class="footnote-ref" data-footnote="true" id="fnref-5"><a class="footnote-link" href="#fn-5">5</a></sup> Their small sizes suggest rocky worlds, though size alone does not establish their composition. What catches my imagination is how early this system assembled. It dates to when the Universe was about 2.6 billion years old, with roughly the same billion-year uncertainty—long before our own Solar System formed.
Kepler-444 belongs to the Galaxy’s thick disk, an old population formed from gas with fewer heavy elements, the raw material for rocks and planets. Even with that leaner supply, it built five small worlds. This one system opens up an enticing possibility: other ancient stars could have had planets for billions of years before Earth appeared.
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I can imagine a crew wondering what life might do with that head start, while their instruments ask a less romantic question: did any of those worlds keep their water and air? A long history gives an atmosphere more time to leak away, too. Finding an ancient planet would be the beginning of the investigation.
## A promising world has to survive a second look
Kepler-444’s five planets bring us back to the practical problem. All circle their star in under 10 days, compared with Mercury’s 88-day year, and all orbit closer to their star than Mercury does to the Sun.<sup class="footnote-ref" data-footnote="true" id="fnref-6"><a class="footnote-link" href="#fn-6">6</a></sup> These are hot, tightly packed worlds rather than the temperate landing sites our crew would hope for. Their ages are exciting evidence for early planet formation, even if their surfaces would be a poor place to go looking for liquid water.
Kapteyn’s Star offers a different kind of frustration, only 12.8 light-years away. It is the nearest halo star, part of the sparse ancient population surrounding the Galaxy’s disk.<sup class="footnote-ref" data-footnote="true" id="fnref-7"><a class="footnote-link" href="#fn-7">7</a></sup> In 2014, astronomers announced two planets there. One candidate, Kapteyn b, seemed to orbit every 48 days in the habitable zone; the discovery paper called it the oldest potentially habitable planet then known. An ancient world that close sounds like a wonderful target for a fictional expedition.
But a 2015 analysis traced that tempting signal to the star’s own activity. The star rotates every 143 days; the way the observations sampled its activity produced a shorter, planet-like repetition at about one third of that period, or 48 days.<sup class="footnote-ref" data-footnote="true" id="fnref-8"><a class="footnote-link" href="#fn-8">8</a></sup> In the NASA Exoplanet Archive record checked September 29, 2026, Kapteyn b is listed as a false positive.<sup class="footnote-ref" data-footnote="true" id="fnref-9"><a class="footnote-link" href="#fn-9">9</a></sup> I find that unsettling in the most interesting way: a convincing signal can put a habitable world on our charts when the world may never have been there.
In Book 1, Chapter 23 of *Destiny Among the Stars*, Luca tells the crew that a planet with an atmosphere or in the habitable zone will need a landing, taking time from their survey work. They have just over three months at Alpha Centauri. Imagine planning that precious time around a supposed planet, then discovering that the destination was stellar noise. The mistake would be in the chart and the plan, long before anyone could attempt a landing; that is why the crew would want a promising signal checked before committing to it.
## So could any of the oldest stars host life?
No confirmed planet in a temperate orbit is known at any of these three stars. Their great ages give us a reason to look, and their individual histories give us reasons to look carefully. I would love to know whether an ancient world nearby managed to keep its oceans through all those billions of years—and what a crew would find if it did. Age opens that possibility; observations of the planets themselves will have to tell us how far it goes.
Kepler-444’s five small worlds also leave me wondering how much building material a star really needs. [How does a star’s metallicity affect whether its planets are worth visiting?](https://ocwanderer.com/blog/how-does-a-stars-metallicity-affect-whether-its-planets-are-worth-visiting)
> [!lore] If you want to see a crew weigh a promising world against the time it costs to check it, [start *Destiny Among the Stars*](https://ocwanderer.com/storytime/story/destiny-among-the-stars).
## Endnotes
1. <span id="fn-1"></span> H. E. Bond et al., "HD 140283: A Star in the Solar Neighborhood that Formed Shortly After the Big Bang," *The Astrophysical Journal Letters* 765 (2013), L12, [DOI](https://doi.org/10.1088/2041-8205/765/1/L12), [arXiv](https://arxiv.org/abs/1302.3180). Parallax 17.15 ± 0.14 mas (190 light-years); age 14.46 ± 0.31 Gyr from parallax alone, about ± 0.8 Gyr with composition and model uncertainty; the paper compares it with a Universe age of 13.77 ± 0.06 Gyr. <a class="footnote-backref" href="#fnref-1" aria-label="Back to reference 1">↩</a>
2. <span id="fn-2"></span> J. Tang and M. Joyce, "Revised Best Estimates for the Age and Mass of the Methuselah Star HD 140283," *Research Notes of the AAS* 5 (2021), 117, [DOI](https://doi.org/10.3847/2515-5172/ac01ca), [arXiv](https://arxiv.org/abs/2105.11311). 12.01 ± 0.05 Gyr statistical, 12 ± 0.5 Gyr with modeling uncertainty. <a class="footnote-backref" href="#fnref-2" aria-label="Back to reference 2">↩</a>
3. <span id="fn-3"></span> M. S. Lundkvist et al., "Asteroseismic investigation of HD 140283: The Methuselah star," *Astronomy & Astrophysics* (2025), [DOI](https://doi.org/10.1051/0004-6361/202556292), [arXiv](https://arxiv.org/abs/2510.11532). 14.2 ± 0.4 Gyr, in agreement with the age of the Universe within 1σ. <a class="footnote-backref" href="#fnref-3" aria-label="Back to reference 3">↩</a>
4. <span id="fn-4"></span> Lundkvist et al. (2025), [Fe/H] = −2.3. Author calculation: 10^−2.3 ≈ 1/200 of the Sun's iron abundance; 12 to 14.5 Gyr divided by the Sun's 4.6 Gyr gives about 2.6 to 3.2; “roughly two and a half to just over three” accommodates these estimates. <a class="footnote-backref" href="#fnref-4" aria-label="Back to reference 4">↩</a>
5. <span id="fn-5"></span> T. L. Campante et al., "An ancient extrasolar system with five sub-Earth-size planets," *The Astrophysical Journal* 799 (2015), 170, [DOI](https://doi.org/10.1088/0004-637X/799/2/170), [arXiv](https://arxiv.org/abs/1501.06227). Age 11.2 ± 1.0 Gyr; thick-disk, metal-poor host; planet sizes between Mercury and Venus. Rocky composition is an inference from their small sizes. Author calculation: 13.8 − 11.2 = 2.6 Gyr after the Big Bang, with about 1 Gyr uncertainty inherited from the stellar age. <a class="footnote-backref" href="#fnref-5" aria-label="Back to reference 5">↩</a>
6. <span id="fn-6"></span> NASA/JPL, [“Astronomers Discover Ancient System with Five Small Planets”](https://www.jpl.nasa.gov/news/astronomers-discover-ancient-system-with-five-small-planets/) (2015): about 117 light-years; all five orbital periods under 10 days; Mercury's period is 88 days. <a class="footnote-backref" href="#fnref-6" aria-label="Back to reference 6">↩</a>
7. <span id="fn-7"></span> G. Anglada-Escudé et al., [“Two planets around Kapteyn's star: a cold and a temperate super-Earth orbiting the nearest halo red dwarf”](https://arxiv.org/abs/1406.0818), *MNRAS Letters* 443 (2014), L89. The discovery-paper abstract describes the habitable-zone candidate as the oldest potentially habitable planet then known; this is the 2014 claim, superseded for Kapteyn b by notes 8–9. Distance 12.8 light-years (3.93 pc) from the [NASA Exoplanet Archive, "Kapteyn Overview"](https://exoplanetarchive.ipac.caltech.edu/overview/Kapteyn). <a class="footnote-backref" href="#fnref-7" aria-label="Back to reference 7">↩</a>
8. <span id="fn-8"></span> P. Robertson, A. Roy and S. Mahadevan, "Stellar activity mimics a habitable-zone planet around Kapteyn's star," *The Astrophysical Journal Letters* 805 (2015), L22, [DOI](https://doi.org/10.1088/2041-8205/805/2/L22), [arXiv](https://arxiv.org/abs/1505.02778). The 48-day period is one third of the 143-day rotation period. Sections 3.2 and 4 identify it as a rotation harmonic; sampling of stellar activity allows power to leak into shorter periods. <a class="footnote-backref" href="#fnref-8" aria-label="Back to reference 8">↩</a>
9. <span id="fn-9"></span> NASA Exoplanet Archive, [“Kapteyn Overview”](https://exoplanetarchive.ipac.caltech.edu/overview/Kapteyn), accessed September 29, 2026: Kapteyn b a false positive planet; Kapteyn c confirmed but controversial. <a class="footnote-backref" href="#fnref-9" aria-label="Back to reference 9">↩</a>