Walking a mile in someone else’s shoes is one thing. Fitting into your own shoes — decades after buying them — is another story.

“A very common misconception is that a person’s shoe size doesn’t change,” Dr. Rock Positano, a podiatrist and co-director of the Non-Surgical Foot and Ankle Service at the Hospital for Special Surgery in NYC., told The Post.

In reality, he said, “it is unlikely that your shoe size at age 20 is going to be the same at age 50.”

But plenty of people never get the memo. A large body of research shows that most people are wearing shoes that don’t properly fit their feet.

One landmark study found that, among 356 women…

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