Is this dialogue ok?
A. Where did you find it?
B. I found it among the old things in the attic. or I found it among the old stuff in the attic.

Question

Is this dialogue ok?
A. Where did you find it?
B. I found it among the old things in the attic.  or  I found it among the old stuff in the attic.

Answer

Both are fine. :)

Answer

Well, it technically is correct, but with the second part of B, it would be more natural to say that I found it "in the old stuff in the attic" as stuff is informal, so then among tends to be too formal for a case like that in normal conversation.

Hope I helped ^^

Answer

Grammatically, both sentences are correct :)