'While We're Young' Trailer: Ben Stiller Doesn't Wanna Grow Up

What happens when you hit your 40s and realize you still feel "like a child imitating an adult"? Well, if you're Ben Stiller and Naomi Watts in While We're Young, you befriend a pair of 25-year-olds (Adam Driver and Amanda Seyfried) and embark on wild adventures like ayahuasca ceremonies and hip-hop dance classes.

Then, not surprisingly, you discover that fulfillment doesn't lie that way. And also that your arthritis will prevent you from keeping up with your cool young friends. Watch the trailer for Noah Baumbach's While We're Young after the jump.

Yahoo debuted the new While We're Young trailer.

You know it's time to grow up when a former Beastie Boy (specifically, Adam Horovitz) is wondering what the hell is wrong with you.  While We're Young lands in theaters March 27, 2015.

Ben Stiller and Naomi Watts are Josh and Cornelia Srebnick, happily married middle-aged members of New York's creative class. They tried to start a family and were unable to — and have decided they're okay with that. But as Josh labors over the umpteenth edit of his cerebral new film, it's plain that he has hit a dry patch and that something is still missing.

Enter Jamie (Adam Driver) and Darby (Amanda Seyfried), a free-spirited young couple, who are spontaneous and untethered, ready to drop everything in pursuit of their next passion — retro board games one day, acquiring a pet chicken the next. For Josh, it's as if a door has opened back to his youth — or a youth he wishes he once had.

It's not long before the restless forty-somethings, Josh and Cornelia, throw aside friends their own age — including Beastie Boy Adam Horovitz in a sly supporting role — to trail after these young hipsters who seem so plugged in, so uninhibited, so Brooklyn cool. "Before we met," Josh admits to Jamie, "the only two feelings I had left were wistful and disdainful." But is this new inspiration enough to sustain collaboration and friendship with a couple twenty years their junior?