my $orderby = "age"; # or name, dob, etc
my $direction = "ASC"; # or DESC
my $sortfunc = getsort($direction);

foreach my $id (sort $sortfunc keys %hash) {
  print "$id - $hash{$id}{$orderby}\n";
} # end-foreach

sub getsort {
        my ($direction) = @_;
        my $sense = $direction eq "DESC" ? -1 : 1;

        return sub {
                ( $hash{$a}{$orderby} <=> $hash{$b}{$orderby}
                  ||
                  $hash{$a}{$orderby} cmp $hash{$b}{$orderby})
                *
                $sense;
        } 
}