143M Americans Affected and by Census'[0] count, there are ~327M Americans.
Chances are, if you're an adult American you are impacted. Even if you did not authorize Equifax's "services", a third party most likely did it for you, and you are impacted.
Note that your credit score or lack thereof is often used to deny housing and (for generally unsubstantiated reasons,) employment.
The fact that Equifax is not held accountable is one of the biggest data-related atrocities of the modern era.
Chances are, if you're an adult American you are impacted. Even if you did not authorize Equifax's "services", a third party most likely did it for you, and you are impacted.
Note that your credit score or lack thereof is often used to deny housing and (for generally unsubstantiated reasons,) employment.
The fact that Equifax is not held accountable is one of the biggest data-related atrocities of the modern era.
[0]: https://www.census.gov/popclock/