Join Date: Jun 2010
Location: Alberta, Canada
As to the title of your post, yes it is VERY possible to teach an old horse natural horsemanship (since natural horsemanship works off of the horse's natural instict and language, which ALL horses know). I started my Arabian mare in NH at 17 and she picked it up like a pro. We go bareback all the time in a halter or just with a rope if we are in the arena or field.
As for your actual post about your friend, i would personally suggest her getting the basics down first before trying NH. NH involves alot of instinct and imagination, by which you have to be able to understand the horse, how, why and when it responds to certain stimuli, and above all how to know when to apply and release pressure.
If she doesn't know this (and novices typically wont) she could end up doing more damage than good and just confuse the horse.
"If a horse fails to do something that is because he was not trained to do it. If a horse fails to do something properly that is because he was not trained properly."