Yeah, the OP is a little misleading. There is technically an very large number of addresses that may have been created on or before 2014 compared to the number that were actually used. For example, a seed-based wallet pretty much creates an infinite (or rather, can generate an infinite) number of addresses, but that does not necessarily mean that all of them have appeared in the Blockchain. I am not familiar with CLAMS which the earlier poster talked about, but it is safe to assume that the created addresses must have appeared on the blockchain at a point on or before 2014 to be eligible for them.