The Brazilian Football League is highly regionalised because of the vast size of the country. The structure of the league has changed frequently from year to year as different configurations are experimented with. Many of the most important matches each season are derbies, especially those in São Paulo and Rio de Janeiro.
There follows a regionalised list of the noted teams in the Brazilian football league.
... age of 18, 9.4% from 18 to 24, 34.6% from 25 to 44, 19.4% from 45 to 64, and 10.6% who are 65 years of age or older. The median age is 34 years. For every 100 females ...