[R] Turn dates into age

[frenchcr]

Ive got a big column of dates (also some fields dont have a date so they
have NA instead),
that i have converted into date format as so...


dates<-as.character(data[,"date_commissioned"]); # converted dates to
characters
dates[1:10]
[1] "19910101" "19860101" "19910101" "19860101" "19910101" "19910101"
"19910101" "19910101" "19910101" "19910101"

dateObs <- as.Date(dates,format="%Y%m%d")
dateObs[1:10]
[1] "1991-01-01" "1986-01-01" "1991-01-01" "1986-01-01" "1991-01-01"
"1991-01-01" "1991-01-01" "1991-01-01" "1991-01-01" "1991-01-01"



Now i need to turn the dates into years, how do i do it? Im not worried
about fractions of years, whole years would do.


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