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I still find people who do this
(slrpnk.net)
At my last job, a bunch of the older folks did not realize they had a "two spaces" habit.
It's a clear tell.
Saw this meme and thought I'd point that out.
Two spaces after a period was the way typography was taught and graded through the late nineties and maybe later. On a keyboard my thumb automatically double taps the space bar after a period. No thought, just reflex. On a phone, I never type a period. My keyboard app automatically inserts a period after a double space.
Someone above said that the standard didn't change until 2019. I was never taught to double space after a period, but I went to poor schools with bad teachers.