We have a number of personal credit lines with that haven't been used in years - and we also don't have a current address for many of them. Am wondering if there are any notification requirements if we decide to close out these lines. I believe we have the right to close the line for non-use, and I don't think adverse action applies and I also don't see that I have any obligation to provide notification under Reg Z. Am I missing anything?

Refer to your contracts. Most likely they will have a cancellation clause in them that requires notification in writing by the party canceling the account.

Closing an account for inactivity is not adverse action under Reg. B.