2/2 ....Barras Bravas but plenty of normal fans can sit on the fringes no problem and there are always seating areas where there is hardly ever problems only for a few squid more.  Remember 2.5 million people visited Buenos Aires last year along and enjoyed the energetic, beautiful, 24-hour nightlife, food and culture capital that it is, not to mention the friendly and beautiful wimmin ;) Put your Xenophobia and prejudices aside and visit it, pensioners won't really mug you!