Age as given in 1841 census would indicate born about 1786.

In 1851, granddaughter Helen MacKay, age 11 (b about 1840, Ayr, Ayrshire) was living in household. Also in 1861 census in household, but age 27 indicates year of birth about 1834.
In 1861, Margaret Dobbie, age 69 (b abt 1792 in Straiton, Ayrshire), widow, Cook, was in household.
Also in 1861, grandson John Hunter, age 7 (B about 1854, Ayr), and granddaughter Elizabeth Hunter, age 3 (b about 1858, Ayr).

Not in 1861 census and cannot find death in registers after 1855, so probably died between 1851 and 1855.

Age as given in 1841 census would indicate born about 1781.