Odds of it being plume are slim due to age. I have seen cigars plume in just a few years, but that's rare (and these aren't that old). And as others have said, regardless of what it is I'd just wipe them off with a slightly damp towel and you're good to go. Even if it's plume, wiping it off won't hurt (it's not like plume tastes good in itself or anything).
But forget about the age for a moment. IMHO, it's raised off the wrappers too much to be plume. Yet, it doesn't look like any mold I've seen either (though maybe I can't zoom in as far as Jfire). It does not look like sawdust to me either, though it could be.
My guess is that it's something organic from either the wrapper itself--many stalk-cut wrappers are just naturally sparkly--or just dried pectin from the rolling process. It could be gold dust from a poor batch of bands as well (I've seen tons of sparkly cigars that are just residue from the gold on the bands).