First was the Age of Sky, where they were born upon a snowflake and drifted on the wind.
HHaW takes place in the Age of Land, when that snowflake landed on a flower and melted, and Whoville colonized the New World.
In the future will be the Age of Water, when a great flood will carry the flower away and Whoville will then adapt to live within a bubble beneath the waves.
and finally the Age of Fire, judgment day; when the God of Who will rain his wrath upon The Who Heathens
