Hi:
Apologies for posting so late to this thread; I just discovered this message through a Google Search for Alexander Cameron!
The Alexander Cameron you are seeking is my GG grandfather. Our family records indicate that he was born in 1814, and this is the year that is also given in the newspaper article announcing his death in 1901. However, as you have found, a census record gives his birth year as 1815.
Here is a quote from the 1901 newspaper article: "The late Mr. Cameron was born in Inverness, near the foot of Ben Nevis in 1814." I was told that he immigrated to Canada in the year he was born.
As for his parents, I am still trying to pin them down. I was told his father's name was Ewen, and that his mother was also a Cameron.
Please let me know if there is other information you are seeking, and I will try to help.