This, and simply ignoring them until they use your preferred name, are both very effective tactics

"It’s giving student house, and we are 29 and 33 respectively"

Me at 41 with no matching mugs 😔

As soon as I became a father I became one of those Dads who asks the polling station workers if it's been busy yet, are they there for the day, will they get a break at all, and has anything mad happened.