[R] referencing last row in a column

[fugelpitch]

I am trying to set u a limit for my plot window according to the range of a
year column I have.
The first year in the range is just simply the first row, referred to as
data$year[1]. How can I find the last row in a similar way to set the last
year in the range?

What I want to accomplish is the following: "plot(....,xlim =
c(data$year[1], data$data[lastrow]),...)", is this possible? 
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