How old is nudity acceptable?

it should be up to the children unless there is a legal issue. i am a 14 y. o. boy and i shower with my 17 y.o. sister about once a week. we don't do anything sexual, just wash each other. we sometimes see each other naked in each other's room. we rarely see our parents naked. we must be fully covered when guests are in our house.

There is no reason for anyone to have to be dressed in their own home.

You are right, it is stupid not be nude at home. I am nearly all the time nude. It feels good.

And that should be true, regardless of who may be visiting or who comes to the door. It's your house, nude should be completely normal.

Yes, even when the friend of my son is visiting. I am fully nude and he is okay with it. Of course he looks always very closely at me. But in my house I can do it.