okay, ive been watching Grey's pretty much since the beginning and lately ive been trying to get my head around the whole age thing of all the characters... i think im getting closer to some of their actual ages on the show so here i go...



Meredith Grey - I'd say she'd be about 28 or 29 years old [in her 2nd yr at seattle]... considering in a previous season conversation with her mother we've established that she took time off after college to figure out what she was going to do with her life so she was going to backpack of travel around europe but because her mother fell ill [with alzheimers] she had to return so we'd have to assume that she either started med school when she was 22 [graduating at 26] or she took that year off to care for her mother before putting her in a nursing home so she started med school at 23 and graduated at 27.
Cristina Yang - has a BA a MD and a PhD... so i'd say she'd be about 29-31 years old [in her 2nd year at seattle] considering she did 4 years of college, 4 years at med school and coz i dont know exactly how long a phd takes im guessing 2-4 years
Izzie Stevens - when lexie read her file it said that she spent 6 years in med school so she'd about 29 years old [in her 2nd yr at seattle]
George O'Malley - Dont know about george so im guessing somewhere about 27-28 years old
Alex Karev - same with george... not really sure so id same the same... [both in 2nd yr at Seattle]
Lexie Grey - finally someone whose age was actually stated on the show... when alex is telling her about his own alcoholic father (s4 ep) he tells her that he had to begin cleaning up after him when he was 7 and who cares if she had to wait til she was 24. so lexie is 24 years old and according to my calculations she mustve been a few years ahead at school [graduating high school at 16, college at 20 and med school at 24]
Miranda Bailey - in the s4 episode when theres the school bus crash and theres that markus dude.. well, when they bring him in they say that he's 34 years old so assuming they were in the same year in high school, miranda would also have to be 34 years old.

i have no idea about the others but i'm assuming that Derek Shepherd, Mark Sloane and Erica Hahn are all in their early 40's [maybe late late 30s]... Callie Torres must be the same age as Miranda Bailey because they both fought out for chief resident together... and i'm also assuming that Richard Webber is in his 50's.