It may be becasue I am an administrator, but I can edit any posts, regardless of how old they are. How about anyone else?

Meredith, to the left of where you post, do you see the Options? IF so, is the one checked that says Preview Reply? If so, every time you post, you should be able to edit before it appears live.
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Founder Emeritus of Boomer Women Speak and the National Association of Baby Boomer Women.
www.nabbw.com
www.boomerwomenspeak.com