In the Custom Module I have 500 Records , this 500 record only want to view to the specific user only example user A ,

In the Custom Module I have 500 Records , this 500 record only want to view to the specific user only example user A ,

In the Custom Module, I have 500 Old records that should only be visible to a specific user, for example, User A.
Any new records created from today onwards should be visible to Record owner in the Custom Module.

Pls help how i achive this .