But the practice is frowned upon by many doctors and some others who say it should be reserved for the terminally ill.
A noted ecologist and botanist, 104-year-old David Goodall reportedly took his final breaths as the song he chose, Beethoven's "Ode to Joy", came to a close. A doctor put a cannula in his arm, and Goodall turned a wheel to allow the solution to flow, Exit International said.
The scientist had travelled to Switzerland after his home country denied him help of ending his life.
CNN notes that the 104-year-old scientist had advocated for the legalization of assisted suicide in Australia and that his home state of Western Australia is now debating whether to introduce the policy.
A group named Exit International helped Goodall find a suitable place to commit assisted suicide.
Generally, the assisted suicide laws provide that mentally competent, terminally ill adults can request a prescription medication from their cooperating physician that would hasten their death, according to the website Death with Dignity.
In less than 24 hours, Australia's oldest scientist will be injected with a lethal mix of drugs, closing the chapter on his 104-year life.
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The Associated Press quoted Exit International's Nitschke, who was present at Goodall's side, saying that the British-born Australian answered, "with great clarity", the control questions to ensure patients are aware of who they are, where they are, and what they are about to do.
"What I would like", Goodall said, "is for other countries to follow Switzerland's lead and make these facilities available to all clients, if they meet the requirements, and the requirements not just of age, but of mental capacity".
"I could still enjoy birdsong", he added.
"I greatly regret having reached that age; I would much prefer to be 20 or 30 years younger", he told the Australian Broadcasting Corp. during the festivities in April.
Dr Goodall told reporters on Wednesday: "One should be free to choose the death, when death is at an appropriate time".
"I'm looking forward to it", he said of his imminent death.
"I would quite like to be remembered as an instrument of freeing the elderly from the need to pursue their life irrespective", the honorary research associate at Perth's Edith Cowman University said, according to The Local. After an uproar and support from scientists globally, the decision was reversed.