Currently, all the time, I get the exclamation from members of all generation, "You still working!"
Today, as I was walking my dog it came from a fellow Baby Boomer who spent most of her life rearing a family. A few days ago it came from the part-time Millennial clerk in property management. Before that it came for the full-time Generation X clerk in property management.
There's also another version of that. When I presented myself for a just-in-time writing tutoring position, the interviewer said, "You're semi retired." It wasn't a question. It was a statement. I replied, "No, I put in 80 hours a week in the communications boutique I operate."
The other piece of etiquette that's needed is to acknowledge our presence. In social situations, including standing on line in the supermarket, we are treated as invisible. Conversation goes around us. No eye contact made.