Rubyのuniqの条件を複数指定する

gistfile1.rb

hash = [{id: 1, name: 'taro', old: 22, sex: 'men'},
        {id: 2, name: 'hanako', old: 22, sex: 'woman'},
        {id: 3, name: 'taro', old: 24, sex: 'men'},
        {id: 4, name: 'taro', old: 24, sex: 'woman'},
        {id: 5, name: 'taro', old: 22, sex: 'woman'},
       ]

p hash.uniq { |h| [h[:name], h[:old]] }
# => [{:id=>1, :name=>"taro", :old=>22, :sex=>"men"}, {:id=>2, :pname=>"hanako", :old=>22, :sex=>"woman"}, {:id=>3, :name=>"taro", :old=>24, :sex=>"men"}]