#!/usr/bin/perl
use strict; 

my $older_than = 45;

# my @dirs = #could be this depending then just foreach them

my @files = </Users/somedir/*>;

foreach my $filename (@files) {
    next unless (-d $filename); # this is only letting dirs get past
    if ( int( -M $filename) > $older_than) {
        #do something
        print"dir is old:$filename\n";#print what is deleted here.
        # test what you are going to delete 
        #&erase_directory ($filename); # after test uncomment this
        #rmdir $filename; # after test uncommnet this

    }
}

sub erase_directory {
    my $directory = shift @_;
    my @files = <$directory/*>;
    foreach (@files){
        unlink "$_";
    }
}