My mum has alzheimers and parkinsons. She started talking about cannabis to her dr and he said it was illegal in Australia.
So I got her some, made her some cookies, and obviously I didn't put enough in, because they had no effect. If it was going to help her, i'd be ok to break the law and source it and medicate her with it. I don't know that it would have much real effect except to relax and unwind the person a bit. But, if that is of help, i say go for it. At this kind of age, really, it's not like they are out on the streets begging for money to get a hit. They aren't likely to go committing crimes to fund their cannabis habit. If it helps, that's all that matters, and the real cost of cannabis is likely to be alot less than the real costs of some of the other medications they are put on.