My baking powder is "best if used by Mar 2006" and who know when the Worcestershire sauce wandered into my life.. 20 years ago perhaps? Am I killing my family?
The baking powder won't be effective so I wouldn't use it. If the Worcestetshire sauce has been opened but you don't know when, I wouldn't use it
For the baking powder, test a spoonful in a glass of water. If it still fizzes vibrantly, then it's still good. The Worcestershire sauce should be trashed since it's been ~20yrs.
While I certainly would continue using either, I wouldn't panic. Your family was fine before you realized and they'll stay that way. Plus, don't forget, mushrooms are nothing more than fancy fungus spores and mold is a fungus too lol.