I’m an older guy - over 60 - and I absolutely love using slang that was popular before I was born. At work, I liberally say things like “swell,” “keen,” and “golly.” I’ve been doing it for years; when I started, everyone knew what I was doing (most laughed), but now there are a lot of folks who are young enough that they just assume it’s slang I grew up with, which makes me laugh.