Ages on 19th century UK censuses
I am finding a very consistent pattern that the age listed on census values is almost always one year after the baptismal record. I know depending on the date of the census, all ages are typically +/- a year, but this seems to be far too consistent of a pattern. Did these censuses round up? Or did UK ever have a different age system (like Korea or something) where you are 1 at birth?