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Comment by leephillips | Hacker News Reader

You’re feet are older than your head for relativistic reasons, as you say. But not “a lot” older.

yeh it's the "lot" bit I'm confused about. like, aren't they always diverging, therefor the age difference should be a lot, right?

How much is a lot? The parent comment came with 6x10^-7s over 100 years and for 2m tall people. I haven't checked the calculation, but we'll go with that. Is that a lot? If yes, why? Or if not, why not? Let's say it's not 6x10^-7s, but 10s over a lifetime. Is that a lot? 1 minute? 1 hour? So what if it's 1 hour?

This difference causes tidal forces in your body. These tidal forces are minuscule compared to any other everyday interaction that you do. I haven't done the calculation, but I would wager that the tidal effect of even 1 hour over a lifetime is completely dwarfed by everyday interactions and effectively invisible in human everyday life.

Even if it were, there's trillions of cells in your body. The time differences would still have to be incredibly pronounced for it to matter at this scale of entropy.

well, what does pronounced mean? how much time difference is too much?

when I give it more thought, it feels to me that when we say time, we're really say how fast things move relative to other things, and that makes it easier to reason about how different parts of your body are not upset about experiencing time differently

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