I was going to just ask the moms who have 50/50 but on 2nd thought, I'd love to hear from everyone.
I just started doing it because I hate that my bf waits until the kids have no clothes left. So I started taking on his, and his 2 youngest. His oldest is 8 and I think she got embarrassed that I was doing her laundry, so she said she wanted to learn to do her own. My only dd is 13 and does her own.
My DH has 50/50 custody of his teenagers. They know how to do laundry and each do some on occasion, especially during the summer when DH and I work but they don't. They are in charge of their sports uniforms and washing those. We help out with stain questions.
On a regular basis, DH does everyone's laundry except for mine. I do my own.
My DH, DS and SD know to have their laundry in the designated place by Saturday morning if they want it to be washed. That's my day/time to do everyone's laundry, I don't mind. Sometimes, though, the kids will do their own because they're old enough, and because they need something before Saturday rolls around, lol;)
My SD13 does her own laundry. If she'd shown DH or me any appreciation whatsoever for handling it for her in the past, she'd get some help. Anything folded or ironed for her ends up in a wad on the floor, wedged under the dresser, or haphazardly crammed in a drawer, so she's on her own. She seems to like it that way because she doesn't have to answer to anyone. However, she will go six weeks without doing laundry. I don't nag her. I don't even comment when I can smell her school uniform clothes through the body spray she uses. At some point, I figure (hope!) she'll make her own observation about the nasty state of her clothing and make changes accordingly.
SS8 is learning. He gathers, sorts, and folds his own clothes, but I don't trust him to handle the soap and machines yet. Once he has his loads sorted, I make sure they get washed and dried. If he's at BM's house for the weekend when I'm doing the laundry, I'll often fold it for him and just have him put it away later. If he's home, he folds it himself.