@John *****
, the extension of stay you have based on being over 50 (retirement) has nothing to do with your 90 day reporting at all. You're obligated to do a 90 day report when you've spent 90 days in the country.
Your extension also doesn't have anything to do with you exiting/re-entering the country either. If you want to do that you buy a re-entry permit. It doesn't ADD any days to your current extension all it does it let you get stamped in until the expiration of the original extension date.