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Several characters have been played by different actors at different ages:

Character Primary Portrayer Second Portrayer Third Portrayer Fourth Portrayer Notes
Kate Austen
KateS6.jpg

Evangeline Lilly
(ages 24-30)

Little-kate.jpg

Emily Rae Argenti
(age 10)

KateAusten-VD.JPG

Susan Goodwillie (voice in Lost: Via Domus)

Tom Brennan
TomBren.jpg

Mackenzie Astin
(age 25)

5x16 katetom.jpg

Tanner Maguire
(age 10)

Juliet Burke
Julietseason5.jpg

Elizabeth Mitchell
(2001-2007)

Young-juliet.jpg

Rylee Fansler
(1970s/1980s)

Juliet-VD1.JPG

Margaret Easley (voice in Lost: Via Domus)

Rachel Carlson
RachelPortland.jpg

Robin Weigert
(2001-2004)

Young-rachel.png

Savannah Lathem
(1970s/1980s)

Eko
EkoS3.jpg

Adewale Akinnuoye-Agbaje
(ages 33-36)

2x10eko-child.png

Kolawolfe Obileye, Jr.
(child)

Daniel Faraday
Danielseason5.jpg

Jeremy Davies
(ages 18-29)

Young-dan.png

Spencer Allyn
(child)

James "Sawyer" Ford
SawyerS6.jpg

Josh Holloway
(ages 33-39)

Young James Ford.jpg

Gordon Hardie
(age 8)

Little-sawyer.jpg

Keegan Boos
(age 8)

Sawyer-Via Domus.jpg
Eloise Hawking
5x14 EloiseProfile.jpg

Fionnula Flanagan
(ages 59-70)

Eloise-shoots-dan.jpg

Alice Evans
(age 40)

EllieJughead.jpg

Alexandra Krosney
(age 17)

Charlie Hume
5x14 Charlie.png

Marvin DeFreitas
(age 2)

5x03Charlieisborn.png

Unknown (newborn)

Jacob
JacobInTemple.jpg

Mark Pellegrino

Teen-jacob.png

Kenton Duty
(age 13)

Baby-jacob.png

Unknown (newborn)

Omer Jarrah
PortalAltOmer.jpg

Cas Anvar

5x10-omer-sayid-brother.jpg

Xavier Raabe-Manupule
(child)

Sayid Jarrah
SayidS6.jpg

Naveen Andrews
(ages ≤37-40)

Young Sayid.jpg

Anthony Keyvan
(age 8)

Lost Via Domus-Sayid.jpg
Steve Jenkins
and
Scott Jackson
Steve1.jpg

Christian Bowman

Scott-1x07.jpg

Dustin Watchman

Ji Yeon Kwon
IMG 0035.jpg

Jaymie Kim
(child)

4x07baby Ji Yeon Kwon.png

Unknown (newborn)

Sun-Hwa Kwon
SunS6.jpg

Yunjin Kim
(ages ≤24-27)

YoungSun.jpg

Sophie Kim
(child)

Charlotte Lewis
Charlotteseason5.jpg

Rebecca Mader
(age ≤33)

Charlotte-swings.png

Maya Henssens
(1977)

LittleCharlotteWaves.jpg

Unknown (1974)

Benjamin Linus
BenS6.jpg

Michael Emerson
(ages ≤39-40)

3x20 young ben promotional.jpg

Sterling Beaumon
(ages 9 & 11)

3x20 EmilyLinus.png

Amanda
(newborn)

Aaron Littleton
AaronS5.jpg

William Blanchette
(ages 0, 2-3)

See Aaron Littleton#Casting for more information.
Walt Lloyd
5x07 WaltProfile.jpg

Malcolm David Kelley
(ages ≤10-13)

2x02wee-walt.png

Unknown child actor
(age 2)

Emily Locke
Emily.jpg

Swoosie Kurtz

4x11 NamwHimJohn.jpg

Holland Roden
(age 15)

John Locke
LockeS6.jpg

Terry O'Quinn
(ages 39-48)

Young-locke.jpg

Charles Henry Wyson
(age 5)

4x11 Locke'sAnAngryChild.jpg

Caleb Steinmeyer
(age 16)

04x11 premature john.jpg

Unknown (newborn)

Locke-Via Domus.jpg

Paul Eiding (voice in Lost: Via Domus)

Charlie Pace
CharlieS3.jpg

Dominic Monaghan
(ages ≤27-28)

Young-charlie.jpg

Jeremy Shada
(age 8)

CharlieVD.jpg

Andrew Ableson (voice in Lost: Via Domus)

Liam Pace
Liam.jpg

Neil Hopkins

3x21-young-liam.jpg

Zack Shada
(child)

Hugo "Hurley" Reyes
HurleyS6.jpg

Jorge Garcia
(ages 20-25)

Younghurley-closeup.png

Caden Waidyatilleka
(age 10)

Hurley--article image.jpg
Ethan Rom
3x01ethanrom.jpg

William Mapother
(age 27)

5x12-Ethan-teen.png

Devon Gearhart
(teenager)

Baby-ethan.png

Unknown (infant)

Alex Rousseau
Alex.jpg

Tania Raymonde

Alex-swings.png

Lehualani Silva
(child)

Baby-alex.jpg

Unknown (infant)

Danielle Rousseau
4x08 DanielleRousseau.jpg

Mira Furlan
(2004)

4x04Rousseau.png

Melissa Farman
(1988 - 1989)

Jack Shephard
JackS6.jpg

Matthew Fox
(<2001-2007)

Youngjack-closeup.png

John O'Hara
(1970s)

JackVD.jpg

Steve Blum (voice in Lost: Via Domus)

Marc Silverman
MarcSilverman.jpg

Zack Ward

Mark.JPG

Unknown (child)

Miles Straume
MilesS6.jpg

Ken Leung (ages ≤27-30)

Lance ho.jpg

Lance Ho
(child)

Baby-miles.png

Unknown (infant)

Tourniquet man
Tman.jpg

Dale Radomski

Tourniquet Man (3x14).jpg

Kamakani De Dely

Vincent
Vincent-season1-promo.png

Madison

Barkin.jpg

Pono

Charles Widmore
CWidmoreS6.jpg

Alan Dale

CharlesWidmore1977.jpg

David S. Lee
(age 40)

5x02"Jones".png

Tom Connolly
(age 17)

Yemi
Yemi-smile.png

Adetokumboh McCormack

Yemichild.jpg

Olekan Obileye
(child)


The Man in Black

6x09-MiB.png

Titus Welliver

6x15 BiB.png

Ryan Bradford (age 13)

6x15-baby-in-black.png

Unknown (newborn)

5x09christian-dock.png

John Terry

6x14locke-mib-promo.png

Terry O'Quinn

3x05 It'sNotYemi.jpg

Adetokumboh McCormack

5x12-MiB(Alex).png

Tania Raymonde

LOST 0561.jpg

Mirelly Taylor

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