My typical line editing client is someone my age or older and likely 90% of the time, the first correction I need to make is to change all of the sentence endings to contain one space after the final punctuation mark instead of two. I grew up during the typewriter days, too, so this was a habit I had to break as well.
Don’t take my word for it. If you don’t believe me, check out this article by a true writing authority, Writer’s Digest. Thanks to having computers, please save yourself the extra keystroke and your editor an extra step by just including one space at the end of your sentences.
If you forget, it’s easy to fix; simply use the find and replace function in Word, typing “. ” (period-space-space) in the find field and “. ” (period-space) in the replace field. Repeat for question marks and exclamation points.
Truly, this will shave years off your perceived age better than any face lift or tummy tuck ever could.