$arr = array("1"=>array("1"=>array("id"=>5,"gender"=>0,"age"=>14)
,"2"=>array("id"=>33,"gender"=>0,"age"=>23)
,"3"=>array("id"=>143,"gender"=>1,"age"=>43)));

これを

$ages=array(14,23,43);

に加工したいんですが、可能ですか?