I usually go with “oh, same old same old” or “nothing fun” and try to divert back to something someone else talked about. But to be fair, I am a terrible conversationalist.

Tell them about the wicked fart you released yesterday.

Things do happen in your life, nobody lives in a vacuum. You are alive and are experiencing things every day including the stuff that’s happening to all of us. Recent economic news, political drama, geopolitical events, etc are all fair game

I used to think nothing happened in my life then I started to keep a diary/journal and realized that a ton happens all the time!

I hate that kind of question, as if you are expected to live in the fast lane, and all sorts of things should have happened.
It’s probably not meant that way, but it can feel that way. I’d probably answer something along the lines of: “Nothing dramatic. how about you?”

“you know, new day, same old, how about you?” think of it as a game of catch, throw the ball back, if you don’t want to / or have a quick answer.

Song lyrics are always fun.

“I’m another older and deeper in debt.” [16 Tons]

“I’m tired of living and sacred of dying.'” [Old Man River]

“I’m a material girl…” [can’t remember the title…]

You know how at times no news are good news, I’ve only got good news.

“Livin’ the dream.”

The cosmic horrors persist, but so do I

Nothing much, you?

“I am unfortunately still here” is my go-to. People seem to leave you alone if you joke about killing yourself.

The court order was very clear that I am not allowed to discuss that. How about you? Anything new?

“Nothing’s new - same old”

“just the time and date and some cells in my hair follicles”

I’m functioning within normal parameters.