5kg lifter from Orkney wins so far, I've never liked the posters where they tell you being skinny isn't important and... illustrate this with a skinny chick.
My contribution,
Rosemary in January 2013 pulling 80kg at 56kg and 64yo with (in March 2011) herniated L4/5, she'd done a couple of singles already and this was just for the camera so the lockout was brief and she didn't lower it properly. Forgive the blurriness, the phone only cost me $30...
I think her chances of osteoporosis are pretty fucking small.