If they were tracking your data, you are affected. I would imagine almost everyone with a credit history is impacted. Will everyone's get abused...most likely not, but everyone should watch their account activities, and credit ratings for potential problems in the next 5 years.
My opinion is that the people who are going to get nailed first are the ones that do not even know of the the breach at all - basically all the people that have been impacted by Henry and now Irma - they have been so busy trying to stay alive and get out of there, I am sure this breach is not even on their mind and their are a few million people in this state at the moment. Sadly the people who stole this data knows this and will hit those first since their prey is currently blind.
Also, after sleeping on this and thinking about it today, if you are a thief and can get access to 143M people's credit history, why only take a portion and not just take it all? So again, IMHO pretty much anybody over 18 has been hit in some way, there is no reason to only take a portion of the data if you have access to all of it, for over a month. The fact that Equifax came out at all pretty much tells me the data is not encrypted or the keys were stolen with it - as Equifax's thought process seems to keep all the data together in an easy to get to system, I am sure the keys were there too to make it easier on them. Hell, who knows, maybe this was data that was stored in another country that was the lowest bid on a contract to hold data - total speculation but the way Equifax releases the info about the breach, the arrogance of their CFO and 2 other top execs w/ their selling of nearly $2M in stock is just not comprehensible by the average, responsible person.
On top of this, making a 'credit protection' system that once you sign up means you cannot be part of a class action to me shows that they do know what they did was wrong and are just trying to CYA. They know what is coming, the top execs will retire in the coming days, but the SEC or whoever else can and should nail these people to the wall. MAKE AN EXAMPLE OUT OF THEM.