I suspect that's because I'm very active on social media, have a teenage daughter I converse with daily, and write Young Adult novels. But that doesn't mean the "older" idioms don't sneak in. For instance...
When I was writing my book, I referred to the downstairs bathroom in the protagonist's house as a "powder room." You know, the room with just a toilet and a sink? No bath, hence, not a bathroom?
I was told it sounded "too old", and to call it a bathroom. All righty, then.
I also have a bad habit (that I got from my mother, who got from her mother). When someone answers a question of mine with "So?" I immediately reply, "Sew buttons!" Who the hell would do that but some aged aunt who's not playing with a full deck? I do!
I've adapted over the years from some of the things my parents used to say that passed down to me. Thongs became flip-flops, "hodgepodge" became "jumble" and "flabbergasted" became "freaked out." I refuse to let go of doohickey or cahoots, however. I am a writer. I get to use those words.
I won't go so far as to refer to the sofa as a davenport, however. That one stays with my grandmother.
What about you? What words in your vocabulary "date" you?