I got my outdoors boots in late 2016 but due to my knee surgery, I've preferred to wear shoes that don't transfer stress into my knees. Except there times when you really want to wear boots. The leather was drying out a bit.
While cleaning out the room, I came across some expired fancy skin lotion. It has a high vitamin E content, so it should be fine for leather. I bees-waxed the boots ages ago so I'm not concerned about the water proofing.