Question: what is the age difference between meredith and lexie grey?
Answer: Let's also remember that she's now 5 years (if not more) younger than her “half-sister” Meredith – born in 1979 and now, at the end of Season 3, approximately 27 years old. So, how did Lexie get to be one “school-grade” behind Meredith, despite being 5 years apart biologically?