General :: Removing Old Android Devices From Google Account?

I have several older Android devices that I used to use Google+'s Location Reporting feature to keep track of family. A couple of my family members got new phones and I passed on my previous phone back to them. The problem is, I can't seem to get the automatic location reporting (which used to be Latitude, later replaced by Google+'s system).

I think it might have something to do with my old device being connected to my Google Account (and not theirs), though the phones were factory reset and had new account linked to them. I can't seem to remove the android devices from my account (when I install new apps from the online play store, my old devices still show in the drop-down menu).

Is there a way to remove my old devices from my account in hope to get location reporting to function?