Yes, I'm in Adams age cohort, I took "typing classes" (yes with actual typewriters) and double-space after period was standard.  I can understand how for people of this age group typing ".<space><space>" quickly just became a muscle memory.

Literally saw a post today saying 'Anyone over 40 you don't need two spaces after a period.....that was for typewriters....you are free now 😄'

chris21million

Double space for new line but not new paragraph. Markdown was around with that feature since 2004.

More likely origin, though, is from using typewriters. Two spaces after a period was common practice as opposed to one after a comma. Had to do with fixed width characters and creating that extra separation between sentences.

bitcoin

On the recent "who is Satoshi?" talk

crrdlx

That's pretty standard in markdown.
Double space for new line but not new paragraph. Markdown was around with that feature since 2004.

More likely origin, though, is from using typewriters. Two spaces after a period was common practice as opposed to one after a comma. Had to do with fixed width characters and creating that extra separation between sentences.