Just expanding on Brians code to something that will work for vector.
age_years <- function(first, second)
{
lt <- data.frame(first, second)
age <- as.numeric(format(lt[,2],format="%Y")) -
as.numeric(format(lt[,1],format="%Y"))
first <
as.Date(paste(format(lt[,1],format="%Y"),"-",format(lt[,2],format="%m-%d"),sep=""))
age[which(first >
as.Date(paste(format(lt[,1],format="%Y"),"-",format(lt[,2],format="%m-%d"),sep="")))]
<- age[which(first >
as.Date(paste(format(lt[,1],format="%Y"),"-",format(lt[,2],format="%m-%d"),sep="")))]
- 1
age
}
--
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