CHICAGO — I’m no Bryan Johnson , but I was feeling pretty confident when I strolled into the Northwestern Medicine Human Longevity Clinic in July.

I’ve taken several aging tests over the past year to learn how my cells and systems are functioning. One pinpointed my biological age at 29 and another at 36, which is remarkable since I’m 43.

But I was truly humbled at Northwestern’s clinic in the heart of Chicago — and not just because I found it hard to run on a treadmill while wearing a special mask. 8

The clinic, which officially opened in July, puts you through your paces. I wore an uncomfortable, inflated arm cuff to evaluate the inner lining of my blood vessels and vigorously blew into a mouthpiece to measure the strength of my lungs.

“We’re a clinic for people that are

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