They're born on June 13, 1986.  Ashley is 2 minutes older then Mary-Kate.

Ashley is right-handed, and Mary-Kate is left-handed.

Ashley is an inch taller than Mary-Kate.

Their parents Jarnette and Dave divorced in the spring of 1995.

They have an older brother Trent and a younger sister Elizabeth. They also have a half-brother named Jake, and a half-sister named Taylor.

They founded the production company Dualstar in 1993.

After graduating high school they attended New York University. Mary-Kate took a break from school in 2005.

Filmography:

Movies:
New York Minute (2004)
The Challenge (2003)
Getting There (2002)
When In Rome (2002)
Winning London (2001)
Holiday In The Sun (2001)
Our Lips Are Sealed (2000)
Passport To Paris (1999)
Switching Goals (1999)
Billboard Dad (1998)
It Takes Two (1995)
The Little Rascals (1994)
How The West Was Fun (1994)
To Grandmothers House We Go (1992)
Double, Double, Toil and Trouble (1992)

Party videos:
Sleepover Party
Hawaiian Beach Party
Christmas Party
Birthday Party
Camp Out Party
Ballet Party
Costume Party
Mall Party
Fashion Party
School Dance Party
Greatest Parties

TV series:
Mary-Kate and Ashley in Action (2001)
So Little Time (2001)
Two Of A Kind (1998-1999)
Full House (1987-1995)

Guest appearances:
Charlie's Angels: Full Throttle (2003)
Hangin' with Mr. Cooper (1992)
Ellen (Mary-Kate only, 1995)
Sister Sister (1996)
All My Children (1998)
7th Heaven (2000)