LAST EDITED ON 04-16-09 AT 04:19 PM (EST)Total Time Spent on Island when Flashes Began:
Charlotte: 1971-1977
Miles: 1977-19??
Juliet: 2001-2004
Sawyer: 2004 (around 100 days)
Daniel: 2004 (around 10 days)
Assuming Miles left as a young child, Charlotte would have had a much longer exposure to the island than all of the others present during the flashes.
Remember, Daniel/Juliet/Sawyer's presence in the Dharma period hadn't happened yet when they were flashing through time.
Even though we know Daniel's mother was on the island, it is unknown whether or not he was born there like Charlotte and Miles.