(Concern) Is it okay to just leave a 19-year-old who can't organize or tidy up?

At first, I was cleaning up...

I'm becoming an adult now, but I thought this wasn't right, so I watched.

It was really a pigsty.

Snack crumbs, hair, eraser shavings, plastic wraps, and even worn-out socks..

It smells really bad.

I scolded and advised him as well.

We also had long conversations, made plans together, and initially cleaned up together.

I'm getting more and more exhausted... I wonder why it's so difficult doing it alone...

They say they'll work hard, but then they make a mess again and don't clean up.

If she's a girl and 19 years old, isn't she considered young?

I work hard to organize the shared spaces like the bathroom and living room.

I am training them to clean their own rooms.

I'm so frustrated because it's not working well.

One of the symptoms of ADHD is also the inability to organize and tidy up.

They also did the tests, but they said it's not ADHD.

Are there anyone with the same concerns as mine?

Is it better to just pretend not to know and let it go?

I don't feel any frustration.

I just said I would clean up, but when I saw it this morning, it was a mess again.

How do you all educate and care for them?