Simplify the following text for a Grade 12 native English-speaking person.
Original: The game started by dividing the 16 players into four tribes by gender and age : young men ( Viveros , green buffs ) , older men ( La Mina , orange buffs ) , young women ( Bayoneta , blue buffs ) and older women ( Casaya , purple buffs ) .
Simplified: The game began by splitting the 16 players into four tribes by sex and age : young men ( Viveros , green buffs ) , older men ( La Mina , orange buffs ) , young women ( Bayoneta , blue buffs ) and older women ( Casaya , purple buffs ) .