[R] How to filter a data frame?

[rlearner309]

I have a question about how to filter the data frame:
Suppose my data frame has variables like gender, age,... How to get a subset
of the data frame, with only female (or male) and/or age > 50...?  What is
the typical syntax?  I tried several condition expressions, but none of them
worked...

Thanks a lot!
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