The Noah Baumbach dramedy follows the lives of Cornelia and Josh, an adult couple with no children who meet a couple of 25-year-olds and try to adopt their lifestyle.
"It's like their apartment is full of everything we once threw out, but it looks so good the way they have it," Watts' character says in the trailer. "Being around them energizes you."
Amanda Seyfried and Adam Driver (Girls) co-star as Darby and Jamie, the hip young couple that reintroduces Cornelia and Josh to the perks that come with being in your twenties.
Baumbach (of Frances Ha fame) wrote and directed the film, which opens in theaters on March 27, 2015.