Punctuation Telling Our Age. . .

Do you leave one or two spaces after a period at the end of a sentence?   Your habit may be telling a prospective employer your age.  If you have been following my blog,  you know I am old.  I leave two spaces after a period.   When I was in high school we took typing and had six classes each day and the only AP class that was offered was biology. 
If you are mid twenties or younger you probably leave only one space after the period. This is what the computer classes are teaching now.  It is in part because they were learning about typing while texting.   With the texting surge the single space conserves space and time. 
Next time you are applying for a job and send an email or cover letter with your resume, use only one space after a period.