If you haven't took the time out to go see this movie no matter what age you are, then GO SEE IT!. The Avengers made OVER 1 billion dollars. All the characters received equal camera time and they owned it.
Tom Hiddleston is the actor who plays Loki. He's from London, England and has been active since 2001. His mother was a former stage manager and arts administrator and his father a scientist in physical chemistry was also the managing director of a pharmaceutical company.
http://www.youtube.com/watch?v=lVGe7mVBI60
http://www.youtube.com/watch?v=APrpsM3VOAI
http://www.youtube.com/watch?v=cUlztBgStUo
Robert Downey, Jr(Tony Stark/Iron Man) has been active in his career since 1970 and if you do the math and subtract that means he's been exposed to acting since age 5. He's from Manhattan NYC and he's also a screenwriter, producer, singer and songwriter. His father Robert Downey, Sr is an actor, director of underground films, writer and producer and his mother is an actress who appeared in Robert Downey, Sr's films. I must say they created an amazing human being.
http://www.youtube.com/watch?v=SyHuayjK7os
http://www.youtube.com/watch?v=I0hXhGt5XPg
http://www.youtube.com/watch?v=Hd_aN0LAgMo
Scarlett Johansson(Natasha Romanoff/Black Widow) has been active since 1994. As you can see she's not only an actress but a model as well. She's also from NYC with her father a Danish Architect and her grandfather was a screenwriter and director. Her mother was a producer. She is a global ambassador of Oxfam.
http://www.youtube.com/watch?v=we7qnkI95LQ
http://www.youtube.com/watch?v=2c3rxHgfRTo
Chris Evans(Captain America) has been active since 2000. He's from Massachusetts with his mother an artistic director at the Concord Youth Theater and his father a dentist. He's mainly memorable for "Not Another Teen Movie" as Jake Wyler and "Fantastic Four" as Johnny Storm. For those who don't know, although Captain America doesn't have many powers he is the first Avenger before any other character.
http://www.youtube.com/watch?v=dU0W5dD2mc8
http://www.youtube.com/watch?v=_NTTV-10xHM&feature=fvst
http://www.youtube.com/watch?v=O_RrNCqCIPE
Mark Ruffalo(Hulk/Bruce Banner) has been active since 1987. He is also a director, producer & screenwriter. He's from Wisconsin with his mother a hairdresser/stylist and father a construction painter.
http://www.youtube.com/watch?v=KTivdzpDqP0
http://www.youtube.com/watch?v=xUil08tIA8M
Jeremy Renner(Hawkeye) is from California. His mother managed a bowling alley. He attended Modesto Junior College. He's been active since 1995 with his first film being "National Lampoon's Senior Trip". When acting wasn't paying the bills early on in his career Jeremy and a friend of his started a home renovation business. Besides his acting career he's also a musician, singer/songwriter who plays the guitar, drums and the keyboard.
http://www.youtube.com/watch?v=pXE64ynyL34&feature=fvst
http://www.youtube.com/watch?v=wyrtn53OpeU
http://www.youtube.com/watch?v=0TY0tlAmSPU
Everyone should know who this individual is. If not, you're totally lost. Samuel L. Jackson! He's been doing movies since 1972 in films such as "A Time To Kill", "Black Snake Moan", "Snakes On A Plane", and in this movie Avengers he plays as Nick Fury. The original character was changed by Marvel Comics with his consent and Nick Fury was changed to resemble Samuel himself. Samuel is from Washington D.C but was raised in Tennessee with his mother who was a factory worker. Also, after Martin Luther King jr died, Samuel attended the funeral in Atlanta and was one of the ushers. He played a big part in the Civil Rights Movement.
http://www.youtube.com/watch?v=Bim7RtKXv90
http://www.youtube.com/watch?v=M-493KsbW6g
http://www.youtube.com/watch?v=dPGBMb1E2UE
Chris Hemsworth(Thor), has been active in his career since 2002 beginning with television series "Marshall Law", and "Neighbours". He is from Melbourne, Australia. Other films where he can be recognized are "Star Trek", "A Perfect Getaway", "The Cabin In The Woods", and "Snow White & The Huntsman". Chris also has his two brothers Liam and Luke who are also actors. Liam is in 2012's The Hunger Games and The Expendables 2. Luke does more of television work such as Last Man Standing and The Saddle Club.
http://www.youtube.com/watch?v=0Mk8ZJJEYPE
http://www.youtube.com/watch?v=eXfc12BqFkc
http://www.youtube.com/watch?v=2-UMNSVX7_I
Clark Gregg is Agent Phil Coulson. He is also a director and screenwriter. He's been active since 1988 and is from Boston Massachusetts. His father is a professor at Stanford University and former chaplain at Stanford Memorial Church. Clark was a writer for "What Lies Beneath" and "Choke" although for that he was also the director. Clark was stage manager for the series "Lip Service" 1988.
http://www.youtube.com/watch?v=vjIBX5RrG4Q
http://www.youtube.com/watch?v=DYa7_OBEO0U
http://www.youtube.com/watch?v=LIgkbigAzjY
Cobie Smulders plays Maria Hill in the Avengers who works with Nick Fury. She is from Canada and a former model. She's been active with acting since 2001 with her first film "Candy From Strangers". She is also known for her role in television series "How I Met Your Mother" as Robin.
http://www.youtube.com/watch?v=ha_qrwNegTg
http://www.youtube.com/watch?v=vjcIwjT1J4U
Last but NOT least!, Stellan Skarsgrd plays Dr. Erik Selvig. He is from Gothenburg, Sweden and has been active since 1968. His first film was Bombi Bitt. Most of his early roles were in Swedish TV.
http://www.youtube.com/watch?v=Xec5Ht7qFeI
http://www.youtube.com/watch?v=fqZh1tg_bF4
http://www.youtube.com/watch?v=6wknrgJlv_Y