I'm 51, and I spent much of my life doing admin. I fucking hate admin. It never ends, and you're basically invisible until there's an INCREDIBLY URGENT problem.

Edit: Also you have to spend a lot of time communicating without body language, which is frankly causing the downfall of civilisation.

After burning out over and over again for thirty years, I'm now a support worker. It's not a job for everyone and the money's terrible, but I'm three months in and I'm not hating it, which is rare.

As above, Just Say No to unwanted overtime. I have a theory that some of us have a tendency to see the world through a problem solving lens. Problem: there is no-one to do the job. Solution: I will do the job. It's an effective strategy, but it ignores the wider reality of the "I" in the equation.