The TLs that are in dispute are not factored for your score. So you probably bottomed out your AAoA.
Average age of accounts
Average Age of Accounts. Here is a link to some of the common abbreviations we use here.
I believe the way it works is that the TLs are not counted therefore their age isn't factored. Suppose you have 3 TLs on your report. The first is 5 years old, the second is a year old and the third is 6 months old. You'd be looking at an average age of a little over two years. Now if something in the 5 year TL is in dispute, that entire record stops being counted for the time it's in dispute and as such, the average age of account is only including the 1 year old account and the 6 month old account, making the average age about 9-10 months.
Yes, once verified, it will be included again.