Hello. It's October 18.

The youngest T cells you will ever have are in your bloodstream right now. A new service launched this week lets you collect and freeze them below -150°C, available for future use.

The rundown:

Let's get to it. 👇

Scientists discovered how exercise reverses muscle aging - through a gene called DEAF1 that becomes overactive with age and disrupts normal muscle function - exercise suppresses DEAF1, essentially turning off a key aging accelerant in muscle tissue. The finding explains part of why active people maintain muscle quality better as they age. ScienceDaily

Big dogs age faster than little dogs, and rogue jumping genes in the epigenome may be to blame - a study of nearly 900 dogs across 120 breeds found that rapid aging in large breeds is linked to epigenomic changes consistent with increased retrotransposon activity. The dog epigenome may be one of the most tractable natural models for studying how transposable elements contribute to aging rate variation across individuals. Nature

Eating late at night puts your liver at risk, according to a large study from Oregon Health & Science University - the timing of calorie intake matters to liver health independently of what or how much you eat. The findings support time-restricted eating not just for metabolic reasons, but specifically for hepatic protection. ScienceDaily

Elamipretide - a cardiolipin-targeting peptide that already holds FDA approval for Barth syndrome - has advanced to the XPRIZE Healthspan Finals - cardiolipin is a key lipid in the inner mitochondrial membrane, and elamipretide stabilizes it. The drug has one of the few legitimate regulatory track records for a mitochondria-directed therapy, which makes its appearance in a longevity competition significant. Longevity.Technology

Blocking the STING pathway helps preserve bone in aging mice - STING-mediated signals from marrow fat cells drive inflammation and declining NAD+ levels in bone-forming cells. Interrupting this pathway maintained bone density in older mice. Given STING's role in both senescence and age-related inflammation, this adds bone health to the list of systems where STING inhibition may have longevity applications. Lifespan.io

To understand this story, you first need to understand myelin.

Myelin is the insulating sheath that wraps around nerve fibers - the biological equivalent of the plastic coating on a wire. Without it, electrical signals leak, slow down, and become unreliable. Multiple sclerosis is, in essence, a disease of myelin destruction - and the cognitive and physical consequences are severe.

Myelin is produced by a type of brain cell called oligodendrocytes. These cells have been considered essentially beneficial - the brain's electrical insulation department. A new study published in Nature Medicine today significantly complicates that picture.

As oligodendrocytes age, they can become dysfunctional. Instead of producing normal myelin, they start generating abnormal myelin that disrupts rather than protects nerve fibers. The study finds that this cellular dysfunction contributes meaningfully to the cognitive decline that comes with aging.

The science breakdown:

The practical implication: cognitive decline has a new upstream driver that researchers can target. Oligodendrocyte pathways are more accessible therapeutically than neurons, and the possibility of drug repurposing means translation timelines could be shorter than building new compounds from scratch.

👉 ScienceDaily | Nature Medicine

A service called Reservoir was launched this week - a commercial immune cell banking platform that lets people preserve their T cells now, while they're young and functional, for potential use in future therapies.

Their pitch: T cells are the raw material for CAR-T cancer therapies and the cornerstone of adaptive immunity. They're also one of the cell populations that declines most significantly with age - becoming less numerous, less responsive, and harder to manufacture into effective therapies. A 30-year-old's T cells are dramatically more useful than a 60-year-old's. Reservoir asks: what if you banked them at 30?

Cellino has raised $96 million from Khosla Ventures, 8VC, Felicis, Leaps by Bayer, and Engine Ventures, plus an ARPA-H award worth up to $25 million. The technology automates patient-specific cell manufacturing - the banking service is the consumer-facing layer of that platform.

The honest parallel is cord blood banking, which sold parents a similar promise of biological insurance in the 1990s - and most vials are rarely called upon. Whether Reservoir - which runs $4,995 upfront plus $270 a year in storage fees - proves a shrewd investment or an expensive exercise in biological nostalgia will depend on science that hasn't been done yet.

But the underlying cell therapy pipeline is far more advanced than cord blood ever was. CAR-T is already approved. The question is whether preservation technology is good enough and whether future protocols will be able to use decades-old banked cells effectively.

👉 Longevity.Technology

Every civilization has had to make peace with growing old. Ours may be the first that doesn't. The Long Game is the story of how we got here, what's happening now, and where we are headed.

Producers of the longevity documentary Forever Young spent many hours filming and interviewing the world's top longevity scientists - the founders of the field.

They turned it into The Long Game - a 21-chapter deep dive into the science of longevity, featuring contributions from scientists you don't normally get in the same room: Dr. Eric Verdin, Dr. Nir Barzilai, Dr. Richard Miller, Dr. Steve Horvath and Dr. Thomas Lewis.

This is not a summary course. This is exclusive access to the people doing the scientific breakthrough work. Twenty-one chapters that build the foundation to evaluate longevity science yourself.

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Strokes are supposed to be a disease of old age. New data published this week suggests that assumption is dangerously outdated.

Over the past 30 years, stroke rates among adults aged 20 to 54 have nearly doubled. The trend runs counter to overall cardiovascular improvements in older populations - where stroke rates have generally declined - making it all the more striking.

The drivers under investigation: rising rates of hypertension in younger adults, obesity, diabetes, sleep apnea, chronic stress, and inflammatory conditions. Rates of atrial fibrillation - a known stroke risk factor - are also increasing in younger populations.

Why this matters for longevity: a stroke in your 40s doesn't just create immediate damage. It resets the aging trajectory of the affected brain regions and significantly raises the risk of cognitive decline and dementia in later decades. Stroke is one of the most consequential single vascular events for long-term brain health.

The practical note: traditional stroke risk management (blood pressure, cholesterol, no smoking) applies at any age - but the data now says it needs to be applied actively from your 20s and 30s, not just in middle age. Cardiovascular health at midlife is one of the most consistently predictive variables in the longevity literature, and this is another data point reinforcing that.

👉 ScienceDaily

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This week's issue is largely about the brain - what damages its support cells, what happens when the vascular supply fails earlier than expected. Both are downstream of one simple variable: how well oxygenated your brain is. Nestor's investigation into nasal vs. mouth breathing, CO2 tolerance, and the effects of breathing pattern on sleep, cardiovascular health, and stress response turns out to be more relevant here than most people expect. Not glamorous. Genuinely useful.

👉 Get Breath

Food = longevity 👇