We obsess over VO2 max. We track glucose. We geek out over zone 2 training and ApoB levels. But almost nobody in the longevity space talks about hearing.
That's a mistake, and it might be one of the biggest blind spots in how we think about healthspan.
I'm in my 50s. I haven't noticed anything dramatic with my hearing. But I turn on subtitles for everything now. I didn't used to do that. And I've caught myself asking people to repeat things more than I used to. It's the kind of slow drift that's easy to dismiss as "no big deal." Then I started reading the research.
The [2024 Lancet Commission on Dementia Prevention](https://www.thelancet.com/journals/lancet/article/PIIS0140-6736(24)01296-0/abstract) identified 14 modifiable risk factors for dementia. Hearing loss was flagged as the single largest modifiable risk factor from midlife. Not hypertension. Not smoking. Not physical inactivity. Hearing loss. Every 10 decibel decrease in hearing ability increases dementia risk by 4 to 24 percent depending on the study. A [meta-analysis of 50 cohort studies](https://www.sciencedirect.com/science/article/pii/S1568163724001648) found hearing loss associated with a 35% increased risk of dementia and a 56% increased risk of Alzheimer's specifically.
It goes beyond cognition. A [study in The Lancet Healthy Longevity (January 2024)](https://www.thelancet.com/journals/lanhl/article/PIIS2666-7568(23)00232-5/fulltext) followed nearly 10,000 adults and found that people with hearing loss who used hearing aids regularly had a 24% lower mortality risk compared to those who never used them. That held regardless of age, income, or severity of hearing loss.
The [ACHIEVE trial](https://www.achievestudy.org/), the first large randomized controlled trial on hearing intervention and cognition, found that in older adults already at elevated risk for cognitive decline, hearing intervention slowed that decline by 48% over three years. Important caveat: the overall study population result wasn't statistically significant, and the 48% came from a pre-specified subgroup. But it's a compelling signal consistent with the broader observational data.
The mechanisms make intuitive sense. When you can't hear well, your brain works harder just to process speech. That drains cognitive resources. You start avoiding social situations because they're exhausting. Isolation increases. Depression risk goes up. Fall risk goes up. It's a cascade, and it happens so gradually that most people don't realize what's changed.
Here's what really struck me: about 65% of adults over 71 have measurable hearing impairment, but only 15% of people who could benefit from hearing aids actually use them. The [AAO-HNSF Clinical Practice Guideline (May 2024)](https://www.entnet.org/quality-practice/quality-products/clinical-practice-guidelines/cpg-age-related-hearing-loss/) now recommends hearing screening for all patients aged 50 and older. I've had my cholesterol checked annually since my 40s and nobody ever once suggested a hearing test.
I actually got one. My results came back fine. But now I have a baseline, and that's the whole point. When something eventually does change, I'll catch it early instead of five years too late.
If you're over 40 and you've never had a baseline hearing test, go get one. Add it to the same list as your bloodwork and your DEXA scan. Your future brain will thank you.
Anyone else here paying attention to their hearing? Curious if this is on anyone's radar or if it's as overlooked for you as it was for me.