I normally just apply some olive oil and wipe it around, but mine aren't a decade old.
Anyone else use cast iron for cooking? How do you all season your skillets? I've got a skillet (cheap-o Lodge) that is going on a decade old and the seasoning is starting to wear off. I'm not sure what I've been doing wrong, but it's looking pretty bad. I had to re-season it a few years ago after someone watching our house while we were on vacation basically let it soak and it hasn't been the same since.