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A small new study finds that poorer hearing tracks with a specific resting-brain signature long linked to cognitive decline — early evidence, but it sharpens an already-compelling case.
Consumer biological-age tests promise a number that tells you how fast you're aging. A new analysis suggests the signal underneath that number isn't quite what we thought.
At-home longevity tests are graduating from gimmick to research-grade. Here's what second-generation DNA clocks and saliva-based oxidative stress assays actually measure — and what they still can't tell you.