Despite never having taken the drug herself, Mrs Aldridge said her interest in natural medicine spanned some 50 years.
"It's about having the choice," Otamatea member Kathleen Pattinson said. "We want to be able to have the choice of dying pain-free."
The Otamatea chapter, which had about 43 members, had unanimously agreed to write to members of Parliament lobbying for cannabis to be legalised.
They were also opposing a piece of Government legislation that would restrict the sale of certain natural health supplements.
Mr O'Connor said medicinal cannabis would be "one of the most unusual" causes taken up by a Grey Power chapter. "But just because its unusual it doesn't mean we don't approach these things with an objective mind."
"A similar situation would be euthanasia. We've got to get past anecdotal stuff and have a look at the facts. We're well aware of the pros and cons of medicinal cannabis, because of our age group - and regardless of the social commentary."