How Old Are You? Stand on One Leg and I'll Tell You

[erronis]

https://www.medscape.com/viewarticle/how-old-are-you-stand-one-leg-and-ill-tell-you-2024a1000j8j
(This is probably pay-walled so I'll excerpt a few paragraphs. Totally makes sense to me.)

So I was lying in bed the other night, trying to read my phone, and started complaining to my wife about how my vision keeps getting worse, and then how stiff I feel when I wake up in the morning, and how a recent injury is taking too long to heal, and she said, “Well, yeah. You’re 44. That’s when things start to head downhill.”

And I was like, “Forty-four? That seems very specific. I thought 50 was what people complain about.” And she said, “No, it’s a thing — 44 years old and 60 years old. There’s a drop-off there.”

And you know what? She was right.

A study, “Nonlinear Dynamics of Multi-omics Profiles During Human Aging,” published in Nature Aging in August 2024, analyzed a ton of proteins and metabolites in people of various ages and found, when you put it all together, that there are some big changes in body chemistry over time — and those changes peak at age 44 and age 60. I should know better than to doubt my brilliant spouse.

The surprising results come from “Age-Related Changes in Gait, Balance, and Strength Parameters: A Cross-sectional Study," appearing in PLOS One, which analyzed 40 individuals — half under age 65 and half over age 65 — across a variety of domains of strength, balance, and gait. The conceit of the study? We all know that things like strength and balance worsen over time, but what worsens fastest? What might be the best metric to tell us how our bodies are aging?

But the strongest correlation between any of these metrics and age was a simple one: How long can you stand on one leg?

Particularly for the nondominant leg, what you see here is a pretty dramatic drop-off in balance time around age 65, with younger people able to do 10 seconds with ease and some older people barely being able to make it to 2.