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Two fresh studies sharpen what 'biological age' actually measures — one tracing it to the air outside your window, the other to quiet patterns deep in the genome of people who reach 100.
A provocative review of brain tissue from young Mexico City residents argues that ultrafine air pollution may seed neurodegeneration decades before symptoms appear. The evidence is moderate — but hard to unsee.
Two 2025 studies sharpen an uncomfortable idea: what we eat and what we breathe may be shaping the aging brain as forcefully as the genes we inherit.