Perhaps this is the source of your information however his year of birth is stated as 1822 so his age at death is certainly inaccurate.
Extracts from "The Life & Adventures of James McIntosh the Legless Cyclist" ( Son of Alexander McIntosh )
"I was born a sailor, for my father was a sailor, and so was my mother. My Fathers name was Alexander McIntosh, he was a native of Dundee and was born in Butterburn. He went to sea when a boy and worked his way from the forecastle to the cabin by his own abilities and perseverance"
"He was a captain of several good ships, and my mother used to sail along with him. I had a brother and sister older than myself born at sea"
"Before my birth my father commanded the ship Mermaid of London, Gold had been discovered in Australia, and all the world was smitten with the "gold fever" and thousands were rushing to the diggings from all quarters. Fleets of vessels, loaded with merchandise and emigrants sailed for Melbourne and as soon as they anchored in the bay they were deserted by their crews, and the sailors ran off to the diggings to try their luck, and left their vessels to rot in the harbour. My father being deserted by his crew, resolved to try his fortune at the gold diggings too, so he went up the country with his wife and family, and there I first saw the light of this world ( Amehurst, County of Talbot, Victoria, Australia ). For a long time my father was very successful. He began by making tents for the diggers, and that turned out a very lucrative business, and having saved some money he bought a claim, and worked it with fair success for a considerable time. Latterly, however, "luck" deserted him, and after struggling against bad fortune, and loosing any little money he had realised, he abandoned the diggings and returned to Melbourne. Sir George Hothan was the was then Governor of Melbourne and he owned a fine yacht, n board of which my father obtained a situation as Chief Officer, at a salary of about 15 pounds a month. We were very well off in the colonies but my mother grew home sick, and longed to see her native country again. I had a sister who died out there and she was buried at a place called Daisy Hill. It was in the year 1867 that my mother with her children embarked for home , leaving my father behind."
"My father died and left me mother a widow"
The author's birth
McINTOSH James Haddow
Father Alexander Mother Sarah NICHOLSON
Amherst 1857 Reg#7133
There are some very poorly researched trees online and none of them mention Alexander's parents names nor are there any certificates attached.
Cando