While We're Young

Ben Stiller

Josh Schrebnick

Naomi Watts

Cornelia Schrebnick

Adam Driver

Jamie Massey

Amanda Seyfried

Darby Massey

Charles Grodin

Leslie Breitbart

Maria Dizzia

Marina

Adam Horovitz

Fletcher

Dree Hemingway

Tipper

Brady Corbet

Kent Arlington

Matthew Maher

Tim

Peter Yarrow

Ira Mandelstam

Bonnie Kaufman

Ira's Wife

Hector Otero

Frank

Matthew Shear

Benny

Annie Baker

Elise

Quincy Tyler Bernstine

Pepper

James Saito

Dr. Nagato

Deborah Eisenberg

New School Woman

James Manzello

Music Class Band

Laura Hankin

Music Class Band

Stoddard Blackall

Music Class Band

Ariel Bethany

Music Class Band

Juan Torriente

Leslie's Colleague

Dean Wareham

Shaman

Erin Byrne

Ayahuasca Woman

Lily Thorne

Party Guest

Matthew Kaplan

Party Guest

Danielle Slavick

Party Guest

Greg Keller

Party Guest

Nico Baumbach

Party Guest

Liz Stauber

Kent's Sister

Ryan Serhant

Hedge Fund Dave

Wyatt Ralff

Louis

John Wildman

Red Carpet Coordinator

Roberto Pascotto

Tribute Guest

Adam Senn

Bartender

Guy Boyd

Bar Patron

Peter Bogdanovich

Speaker

Jake Perlin

Jake (uncredited)

Greta Lee

Sundance Interviewer (voice)

Scott Rudin

Party Guest (uncredited)