On a cursory glance, I'd say you want to use File::Find, and find2perl

Once you peruse the docs, you can run a regular find using find2perl:

find2perl . -type f -mtime +7 -maxdepth 0 -exec rm {} \;
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This will give you perl code that you can use to perform the find using perl. You can tweak the options as needed to find the files you want.

Another way is to use glob() and then test the mtime to see if the file's not been modified in the last week:

if(-M $file > 7.0) {
    unlink $file;
}
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(Update: for finding in a single dir, merlyn's answer is most likely not only shorter, but better. tis what I get for lagging in posting. The -M stuff would still apply, I think.:o)

--
Me spell chucker work grate. Need grandma chicken.