Hah, when I turned 65 half my brain decided it had worked long enough. My husband and I say that on a good day between us, we have one functioning brain!
I write everything down but since my husband and I are the only people with access to the computers (we have no children and hence no grandchildren), written down notes are safe.
When we travel, cryptic notes are placed on a note card that I keep on me. I wipe all the usernames and saved passwords on the netbook I travel with so if it gets lost or stolen, someone can see where I go and perhaps know that on 98% of the forums I am plodr but they haven't a clue as to what the nonsense, all different passwords might be.