Podbit · The Peter Attia Drive
At 31, roughly one-third of blastocysts are chromosomally abnormal. By 38, it's 60%. By 42, more than 80%. The curve is not linear — it accelerates. Most doctors don't show patients this table, but every woman thinking about timing her family should.
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At 1:01:40 · chapter starts 1:01:24
Renato Tomioka shifts the conversation to one of the most underappreciated facts in reproductive medicine: the non-linear rise in chromosomal abnormality with maternal age. [1] — Renato Tomioka "~35% aneuploidy at age 31–34: At ages 31 to 34, approximately one-third of blastocysts are aneuploid; the rate climbs to 40% by 35, 60% by …" 1:02:00 The curve is not what most people imagine — it is J-shaped, with aneuploidy rates actually higher in very young women (around 20, due to monosomy) than at 25, which represents the biological sweet spot. From 25, the rate climbs: roughly 35% at 31 to 34, 40% at 35, 60% at 38, 70% at 40, and more than 80% by 42. Almost all embryo aneuploidy (93 to 95%) originates from maternal meiotic errors, not sperm. Peter visibly reacts to these figures — he had not thought of 31 as a compromised reproductive age. Tomioka reframes IVF: it does not improve egg quality, it simply converts more ovulatory events into observable embryos. A 40-year-old who produces 8 eggs per cycle — typical for that age — will, after the successive filters of maturity, fertilization, blastocyst development, and aneuploidy screening, often be left with zero or one viable embryo to transfer. He also notes an important nuance: once you transfer a euploid embryo, implantation rates are broadly similar across ages 30 to 40, suggesting it is aneuploidy that primarily limits fertility, not other intrinsic egg qualities.
At ages 31 to 34, approximately one-third of blastocysts are aneuploid; the rate climbs to 40% by 35, 60% by 38, and over 80% by age 42.
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