Why do some not know what the term "S/O" means?

Am I that damn old now?... that people on the internet don't know what "S/O" means??

WTF!

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WildHeart · 41-45, F

In all honesty I only found out after a long time being on EP

Phire1 · 51-55, F

@WildHeart Wow!
The term "S/O" (significant other) has been around for a Long time

WildHeart · 41-45, F

@Phire1 I am a little delayed when discovering most things. Call me slow 🙈

Phire1 · 51-55, F

@WildHeart Ah, no problem.. lol... I've been using the internet since 2002 and have always seen this term used but all of a sudden - people don't know