I've been chopping my glands up small and jarring them with urine added and putting them in a small room in the back of the shop where paint and stuff is stored. That room is kept in the 50's year round. Had good luck with that slower, low, stabilized temp aging process.
Of course I've also got some fourteen year old glands that were the first I ever saved. I didn't know what I was doing and just did what another trapper told me to, cut out hock glands, foot pads, anal glands with about ten inches of intestine attached and all the feces inside and put them in a cleaned out peanut butter jar. No liquid added, and didn't chop them up or anything, just put that jar in the rafters of an uninsulated shed and forgot about them for about ten years. When I opened it up there was a bunch of dried up gunk in the jar, so I poured in some urine, let it set for a couple days to soak it up, stirred it around and added some more and then moved it to the paint room. Completely different odor, but I've caught stuff on that also. Although I don't think I get as good of a reaction it does work and doesn't smell like my other glands.
Honestly I've got as good a reaction with glands stopped fresh as with aged glands and am going to play with mixing aged glands with fresh glands to see if that works as well or better than either alone.