Well, it is, and the workload of ablution becomes greater as you age.

I like to use a fuzzy definition (though, all definitions are fuzzy—what's a chair? Good luck...) based on whether it's common for someone with the means to do so, to pay others to do it for them, by choice and not due to disability or something like that.

Taking a shit? Not work. Cleaning the toilet? Work.

Eating dinner? Not work. Cooking dinner? Work.

Playing badminton on your lawn? Not work. Mowing the lawn? Work.

Napping on your Ikea couch? Not work. Assembling that couch? Work.

How do you define "retirement"?

When you have enough money that you no longer do work for more?

What do you call it when you have enough money but you choose to continue anyway?

In the context of this discussion, the result has to be of value to someone else, that's all. Then you can haggle over how valuable it is. When it is for yourself, the currency is time and energy; you ponder how much to invest on one task versus another.