Bourne Ultimatum

While I read the book The Bourne Ultimatum all I could think was how on earth is the movie going to do this? In the book Marie (who died in the beginning of the 2nd movie) is alive. Conklin (who died at the end of the first movie) is alive and Bourne is in his early 40's I think. (Maybe 50's). I've never read the other two books to know how the other two movies fit the books but in this case I think the only thing they share is the same title and the same main character's name.