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All 26 letters from the founding 6-month sequence. Free, searchable, citation-linked. Reply to any letter to ask a question — Alexander reads every response.
The 2002 panic was based on the wrong age group. The 2023 Hodis-Mack reanalysis tells a different story. 31% lower mortality in the 10-year window.
Pontzer 2021 in Science — 6,421 people. Energy expenditure is flat 20 to 60. The story is redistribution, not crash.
Deep sleep drops 75% from 20 to 50. Why you sleep 8 hours and still feel wrecked. The Walker-lab fix.
Maki & Henderson 2023 — the neuroenergetic transition. Estrogen, glucose, and what HRT actually does for cognition.
The IRS opens a 7-year door at 50. $30,500/year for 10 years = $441,000. Only 14% of women walk through it.
A $2.5B category, mostly modest. Which 2 work. Which 47 don't. What outperforms it for skin.
The Harvard Study finding. Why loneliness peaks at 52. Five concrete moves to rebuild the social architecture.
The 5,246-man trial that answered the cardiovascular question. The 2023 result. The qualification criteria.
FDA-approved (Semaglutide, Tirzepatide) vs telehealth-compounded vs research-grey. Why we won't write buying guides for tier 3.
Why "low T" feels like brain fog (and isn't unrelated to your wife's brain fog). The diagnostic sequence.
Sleep, protein floor 0.8g/lb, resistance 2x/week, alcohol below 4/week. The 12-week trajectory.
The 6-week home protocol, no equipment. Then the gym transition. What to ignore.
Why one drink hits harder. The "moderate drinking is heart-healthy" myth dismantled. The actual safe-zone.
The 14-day reset. Temperature, light, food, alcohol, the anchor cycle. Measurable outcomes.
$40-$200K lifetime tax savings if you catch the dip. How to find your year. The 4-year retirement window most miss.
The survivor benefit math nobody runs. Why higher-earning spouse delaying to 70 protects whoever outlives the other.
20-25 productive years ahead, not 10. The pivot math. Three pivot types ranked by success rate.
When one wants out and the other doesn't. The four conversations in order. What to do if the first one stalls.
The cross-spouse perimenopause/andropause translation. The five household interventions that compound for both.
What you weren't told before starting. Muscle loss, off-ramp, the chronic-use framing. The protein floor non-negotiable.
BPC-157, TB-500, CJC-1295. What we know. Why we won't write a buying guide. What outperforms them.
What's worth your money (fiber, fermented food). What's over-marketed (custom microbiome tests, gut-reset cleanses).
The fracture you don't see coming until it ends your life. The 5-year post-menopause window. The DEXA scan most women don't get until too late.
The pattern that doesn't get attention because it's not the male pattern. The CAC scan. The Lp(a) test. What gets undertreated.
Why depression spikes in late 40s for women. The hormone-mood link that gets treated as midlife crisis. HRT, SSRI, therapy — what works for which.
How small changes actually compound in midlife when nothing big seems to be working. The five architecture changes. What you don't need.