I guess that could be the explanation. I don't recall when I moved that older stuff into the trash. I'll just leave it there to see if it disappears...someday.
If it is actually the time spent in the folder IMO it would be better to have based the age on the mail date to avoid the confusion I am experiencing. On the other hand I guess some can make an argument for how long it's in the folder too. Guess FM has their own reasons and they are the only ones that count!
Thanks.