"I *still* do a double space after the end of sentences."
Heck, so do I, and I was born in 1972 and used a computer before I ever used a typewriter. I think single spaces after end-of-sentence periods not only make it easier to read each sentence, but also are necessary to distinguish sentence-ending periods from periods after abbreviations.
I think '72 was the year I took my semester of typing. lol Did they teach you to put in a double, single or leave it to the discretion of the typist?