I wore gloves when I used to bike commute and now I've started wearing them on my walks. I do it for a couple of reasons:
-As my vision goes, I've noticed that the frequency of tripping over rocks, uneven pavement, tree limbs, and other things has increased. I haven't taken a tumble yet, but it is just a matter of time and the last thing I want to do is to get road rash, have goat heads embed themselves, or cover my hands with mud (or some other brown organic material...eww) when attempting to break a fall.
-They come in handy when encountering low hanging tree limbs or overgrown brush.