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sub num_or_str {
    no warnings 'numeric'; 
...
            $people{$a}->{age}, 
            $people{$b}->{age} 
         ), keys %people;

my @stuff = qw/ 9 -1 -3 hi 0 bye 5 10 /;

...
else {
       @ar = sort { num_or_str($a, $b) } @stuff;
}

my $sort_by = 'age';
my $descending = 1;
...
        return sort { your_conditions( $a, $b)} keys %$people;
    }
}

my @sorted_keys = sort_people( \%people, $sort_on, $descending);