Hi,
Assuming I had the right person, I did a check to see what I could find about Scott Aitken. It appears that in the 1901 Census for Watt, Muskoka & Parry Sound, Ontario (p. 4, family 31), he is with Margaret, his wife, aged 77. He stated that he immigrated in 1850 which would have made him about 25--over the age of what would be considered a child immigrant (but which is too early for any online passenger lists I have access to).
I did find that he was born in 1825 in Bressay, Shetland Islands, Scotland (son of William A. Aitken, Sr. and Mary Ann Murray) and that he died in Ullswater, Muskoka County, Ontario, Canada.
I hope that helps somewhat.