I realized that the password of one of my Google accounts has probably been compromised for more than a year or so. I already changed the password of that account, however I am worried about other accounts (Google and Yahoo) that were linked to this account (like recovery address). Is there a way I can be sure that those other accounts were not accessed using my compromised account?
If I am able to log-in to my other accounts using their passwords (they have different passwords than the compromised one), then is it a sure guarantee that those accounts were not accessed by using the compromised recovery address? In other words, is it possible (or has it been in the last couple of years at least) to access a Google or Yahoo account using their recovery address without changing/resetting the password?