> I've lost some gmail accounts because they will ask me for security questions when I log in with the correct password, and I don't remember them so my account gets locked, so they're gone forever.

Oddly for me it seemed like as time went by I had a better chance of recovering old gmail accounts with spurious remembered information, like the algorithm thinks the longer nobody's in it the more likely you're the owner trying to get in. This was ~10 years ago though.