Winston Churchill did once say "If you're not a liberal at 20, you have no heart. If you're not a conservative at 40, you have no brain".I'm a classical liberal/libertarian.
I think youger people are way more liberal than conservative however. I always find it easier to find teenagers or young adults being leftists than conservatives or libertarians. I still think the left wing is more abundant.
The younger generation is always the most liberal, and large numbers of them do become more conservative as they get older and become less naive about the world and start raising families of their own.
Baby Boomers were liberal hippies in the late 60s early 70s, now they're very conservative.
Generation X were liberal slackers in the late 80s early 90s, now they're considered one of the most conservative generations.
Older Millennials born in the early-mid 80s are already going through this, they voted way more conservative in 2016 than they did in 2012 and 2008. Trump's numbers with this group are huge compared to Romney's and McCain's in the last two elections, and Hillary's numbers are way smaller than Obama's in the last two elections.