Booker DeWitt: born in America, 1875
Ryan: born in Russia (no date given)
Rapture construction began in 1946, finished in 1951. Ryan died in 1960.
If DeWitt = Ryan, that would make him 85 years old when Jack kills him in Rapture.
Ryan's model in Bioshock looks to be in his late 50's to mid 60's.
I seriously doubt that DeWitt = Ryan
Elizabeth and DeWitt apparently visit Rapture after the 1958 new years event, because Rapture is fucked up (whether that's because the developers decided to use existing assets from Bioshock 1 so they didn't have to recreate Rapture from scratch, or if they planned it that way is unknown). However, the bathysphere network being locked down, and DeWitt and Elizabeth being able to access it after that had happened is a pretty minor plot hole. And as far as we know, it was locked down after DeWitt and Elizabeth use a bathysphere to leave Rapture.
That's the problem with multiverse spacetime travel. Anything that can happen, does happen.
Ryan: born in Russia (no date given)
Rapture construction began in 1946, finished in 1951. Ryan died in 1960.
If DeWitt = Ryan, that would make him 85 years old when Jack kills him in Rapture.
Ryan's model in Bioshock looks to be in his late 50's to mid 60's.
I seriously doubt that DeWitt = Ryan
Elizabeth and DeWitt apparently visit Rapture after the 1958 new years event, because Rapture is fucked up (whether that's because the developers decided to use existing assets from Bioshock 1 so they didn't have to recreate Rapture from scratch, or if they planned it that way is unknown). However, the bathysphere network being locked down, and DeWitt and Elizabeth being able to access it after that had happened is a pretty minor plot hole. And as far as we know, it was locked down after DeWitt and Elizabeth use a bathysphere to leave Rapture.
That's the problem with multiverse spacetime travel. Anything that can happen, does happen.