'How to replace all variable names with the contents of the first row in a tibble

Is there a quick way to replace variable names with the content of the first row of a tibble?

So turning something like this:

Subject  Q1   Q2      Q3
Subject  age  gender  cue
429753   24   1       man
b952x8   23   2       mushroom
264062   19   1       night
53082m   35   1       moon

Into this:

Subject  age  gender  cue
429753   24   1       man
b952x8   23   2       mushroom
264062   19   1       night
53082m   35   1       moon

My dataset has over 100 variables so I'm looking for a way that doesn't involve typing out each old and new variable name.

r tibble

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'How to replace all variable names with the contents of the first row in a tibble

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