1

I read a sentence in Word by Word by Kory Stamper which was:

KMD was another editor with 30 years of experience on me, and when I would casually flip through an issue of Time that she had marked after I had, I would marvel at the things she found.

What does "experience on someone" mean here?

2

In this case, to have something on someone means to have that something as an advantage over the person:

have (something) on (someone)
2. To have a particular advantage over someone.
You may think you can beat me, but I've got 10 years' experience on you.
(TFD)

The speaker is saying that KMD has 30 more years of experience than the speaker, which is advantageous.

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