As I’m sure that you’re all too aware, today is National Senior Citizen day. Since Ronald Reagan created the special holiday in an attempt to gain recognition for the most neglected population in the United States, we decided to let you know that your respective grandmothers are still party animals at heart. Don’t believe us? Then why not take them to your closest beer pong table and find out for yourself. The photos below are living proof that Nana deserves at least one guest shot.