What if a quick, painless scan of the tiny blood vessels at the base of your fingernail could reveal how well your heart is aging? A new study published in GeroScience suggests exactly that. Researchers in Taiwan used a cutting-edge imaging technique called optical coherence tomography angiography, or OCTA, to peer beneath the skin of the nailfold in 104 healthy adults aged 80 to 100 years. By combining the resulting three-dimensional maps of mi…
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