[R] Extracting data and saving in excel

[bgnumis bgnum]

Hi all,

I have a dataframe call "data", and have lots of rows. One of them
is data$`birth`
my data has been imported from an excel file in RSTUDIO

I want to obtain in a function  all rows (with the names) where
data$`birth` is bigger than 1979/01/01 and extract in a excel file as an
output (a sub-excel of the original).

Can you guide with the functions I need to use?

I have been many time out of programming and I need a bit of help to get in
fit.

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