1 space or 2 after a period?

I use two.

I am not sure what is appropriate professionally, but I only use one in my communication as the reason for its use is no longer relevant.

I use two. I learned to type in the days of typewriters, and am pretty fast. Tapping the space bar two times is so automatic for me.

Old habits die hard. I learned to type in high school on very old manual typewriters.

I'm retired so I don’t feel I need to change that habit. Who even notices how many spaces after the end of a sentence?

I read a funny article about how double spaces was a dead giveaway that a parent had helped a kid with their college essays. Half the time, I still struggle to remember that one is standard now.

Two.

Omg I had no idea that one space was standard now.

In my defence I have been out of the workforce for 17 years 

I use two as well, but I think word autocorrects it for me. Here you all are always going to get two. You can’t teach this old dog new tricks.

One. I thought we all made that change quite some time ago.

One.

I learned to type on a typewriter, when 2 was standard. Went back to school in my early 40s. My first English professor made sure to remind the class that 1 space after a period was standard. LOL! I wondered if the rest of my 18 & 19 year old classmates were wondering WTH he was talking about. He was & is one of my favorite Profs.

We just had a HUGE debate about this on another board I frequent where we are doing a book study with the actual author.   A millennial participant schooled the GenX'ers that if two periods are used it makes the person on the other end of the keyboard look old.   We GenX'ers who use two periods were able to demonstrate better writing technique and better grammar usage...things like there/their/they're.   The author came back and said his publisher said two spaces are still accepted but the majority of writers are coming in with one space.

I was always taught to use two periods because I learning to type on a typewriter or word processor. As computers have become more prevalent and fonts having proportional spacing two spaces are no longer required.

Old habits die hard.

Two.

I've always used 2 spaces. I just automatically do it. Sorry it if annoys people. What was the original purpose of 2 spaces vs. 1? The whole text looking thing?

It was to give your brain a natural resting place after a sentence, so you’d recognize it (subconsciously) as the “end.” Now computers and automatic formatting insert a little extra space after a period ... not a full two spaces, but a little stopping place (again, subconscious) for your brain. We don’t really notice it while reading, but look closely and you’ll see it.