1851
William McKenzie, 37, victualler and Mason employing 5 men, b. Scotland
Assuming that his age in the 1851 census is accurate, he would have been born between April 1813 and March 1814. I wish these sites wouldn't calculate the birth year by subtracting the age from the census year, because it gives the wrong answer in 3 cases out of 4.
From 1851, The census was always taken about the end of March or beginning of April. Anyone born after early April had not yet had their 1851 birthday, and would have been a year older by the end of 1851. Only people born between January and March had had their birthday - and that's only one quarter of the year. So about three-quarters of ages are incorrectly calculated.
