They say there's no quicker way to show you're OLD than to use two spaces after a period. But hey, at least people will be more likely to understand what you wrote. Which, I guess, sounds like something an old person would want.
A new study found that when you use two spaces after a period instead of one, it makes your writing slightly easier to read.
But don't start double spacing other stuff, too . . . the study also found that if you put two spaces after a comma, it makes it HARDER to read.