Love ’em or hate ’em, this much is true: one day soon, millennials will rule America.

This is neither wish nor warning but fact, rooted in the physics of time and the biology of human cells. Millennials–born between 1981 and 1996–are already the largest living generation and the largest age group in the workforce. They outnumber Gen X (born 1965–1980) and will soon outnumber baby boomers (born 1946–1964) among American voters. Their startups have revolutionized the economy, their tastes have shifted the culture, and their enormous appetite for social media has transformed human interaction. American politics is the next arena ripe for disruption.

When it occurs, it may feel like a revolution, in part because this generation has different political views than those in power now. Millennials are more racially diverse, more tuned in to the power of networks and systems and more socially progressive than either Gen X or baby boomers on nearly every available metric. They tend to favor government-run health care, student debt relief, marijuana legalization and criminal-justice reform, and they demand urgent government action on climate change. The millennial wave is coming: the only questions are when and how fast it will arrive.