How old were you when you realized you could could get away with swearing? Also, what are your thoughts on kids swearing? To me, they're just words. It should be a respect deal that a kid shouldn't cuss around anyone but their peers. There's almost no way to stop them from swearing when they're with their peers. I started casually (basically everything but fuck and the lesser-known words) around age 10-11 and I had the full "vocabulary" by the time I was 12.