My two daughters were not much older than than 11 (two or three years) when I introduced them to the washing machine.
I had done a huge washing and returned it all, clean and dry, to five respective chests of drawers, (breathing a sigh of relief), then a day or two later I found the bathroom laundry basket chock full again. I had told them to put their washing into the basket, but I hadn't expected THAT much.
On closer inspection, I recognised most of the clothes in it - they were things I had folded and put away just a day or two before, unworn and clean. They were in the habit of trying on half-a dozen different outfits each day, rejecting them into a heap on the floor, then wearing something completely different. When I told them to pick it all up, they did so, but it all went into the laundry basket. Muggins dutifully washed it all again and put it neatly away.
So I took them to the machine, told them that from now on they were doing their own laundry, and showed them which program to use (mixed load, medium heat) and how much detergent to put in and how to tumble things dry or peg them outside. From that day on, I only washed for them occasionally. It was an excellent move! The electricity bills went up, but it was worth it.
Their brother was three or four years younger, but being feisty females, they insisted when he was old enough that he too went DIY with the laundry. None of them got into a strop about it, and when they left home they were all. accustomed to looking after their own clothes. They could feed themselves too!