Descriptive adjective? Like "Alice is trans"? Yes, that's definitely fine.

Or maybe the incredibly cool and understanding dilf that is Walter.

To be fair I was in the fandom at that time and I'd blocked that from my memory forgotten all about that until you explained it

Yeah, so then… about 19-20. Still young, but not absurdly so.

From High School.

Speaking purely for myself and not other trans people, it sort of sounds… not exactly insulting, but out of date in a way that suggests that the person saying it's views might be similarly out of date, as it would if one called Mercedes "a negro" rather than "a black woman"

I think the original class are all like 22-24 now. There was a timeskip late in s5 and another one between s5 and s6 so it's now a couple years since they graduated.