All possible Bitcoin addresses, and therefore wallets, have always existed.

It's not like when you open an account at a bank for example. A Bitcoin address is based on math, not a centralized database used by someone to generate a new row when an account is created.

You can only know when a transaction occurred in a particular address, but the address has and will always be there.

The only thing that changes is who has access to the private key of an address. That event could be somehow tracked in certain scenarios, but not in a general way.