What does cadet member mean?

I would expect it is age-related. Are you still in school? That's likely it.

I thought it was an under-18 thing, but I'm 18 and I still have it, so I don't know for sure.

Some forums have different designations to show how much a member posts or how long they have been participating. I never noticed that TradGang has this until seeing your post. I'd imagine it simply means you're a new member.

Guy

It's an age thing.  When you register it calculates of your birthdate I believe.

We need an "old fart" designator for us that are on the other end.  LOL

Mike

Yeh Mike, I was thinking about a "Buck Stud" designator.
seriously tho, it is an age thing as Wingnut said.