You might think millennials are liberal only because they are young. Not true. Political viewpoints, in fact, are remarkably stable over a lifetime. Take the baby-boom generation, for example. Today, 25 percent of boomers say they are liberal. Twenty years ago, when boomers were in their twenties and thirties, almost the same proportion (27 percent) identified themselves as liberal. Today, 35 percent of boomers say they are conservative, nearly equal to the 36 percent who called themselves conservative two decades ago.
The other generations also show remarkable stability in their political viewpoints over time. And each succeeding generation is more liberal than its predecessor.
Source: General Social Survey