Check out the find2perl command. I believe you would be looking for:

find2perl SOMEDIR -mtime +5 -print
[download]

If you re-direct the results to a file you will end up with a skeleton of a perl script you can modify. Change the pertinate lines to make it do what you want. Further, you want to look at Perl's unlink command which does file removal.

Another way of doing it:

# hand waving prior to this
#
chdir $MYDIR;
opendir(DIR,"$MYDIR") or die "Could not open $MYDIR:$!";
while (my $file=readdir(DIR)){
     my $age= -M $file;
     unlink $file if int($age) > 5;
}
closedir(DIR);
[download]

YMMV, HTH