calculating age

I have been playing with a new (not actually new, but new to R) dataset this week. Successes: I loaded the data in using read_csv. I made dates into dates. The interview group is listed as 1s and 2s in the file so R thought those were integers. So I used as.factor to convert. dataframe$variable <- as.factor(dataframe$variable) I used lubridate package to specify that DOB and Test_date were dates with Day Month Year (dmy) format.