How to check whether a checkbox is checked in jQuery?

_x000D_ _x000D_ I need to check the checked property of a checkbox and perform an action based on the checked property using jQuery. For example, if the age checkbox is checked, then I need to show a textbox to enter age, else hide the textbox. But the following code returns false by default: _x000D_ _x000D_ if ($('#isAgeSelected').attr('checked'))_x000D_ {_x000D_ $("#txtAge").show();_x000D_ }_x000D_ else_x000D_ {_x000D_ $("#txtAge").hide();_x000D_ }_x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ _x000D_ How do I successfully query the checked property?