Then again, so many legends about this guy are told that nothing is really distinguishable from the true story. And that goes for his past as well. It would actually be very interesting to try to piece together his life story based solely on word of mouth and legends about him. This makes him such a compelling and unique character in fiction simply because his biography is nearly entirely open source. He's not just Nolan's creation, he's our creation.
I've seen lots of different claims about CIA that may or may not be true (they could all be half-truths for all we know), however, since he's a clean slate at the moment he's introduced to us, anything is possible. Here's a rough outline of his life based on few tidbits of information which have surfaced and have become somewhat canonized, info which is generally accepted and all fits together in continuity (as would be the case, most things don't add up timeline-wise, and this is the best I can come up with atm):
>CIA is born "Bill Wilson" in Ireland between 1966 and 1968
>>generally considered April 21 because [4/21 (21st letter is U) = 4U]
>at some point between his childhood and his joining the CIA, Wilson meets Bane and the two become bitter rivals
>Wilson joins the armed forces, illegally underage
>Wilson serves in Lebanon
>Wilson meets his future wife in 1980s or 90s
>Wilson resides in Newport News, VA
>Wilson joins the CIA in the early 2000s
>>generally accepted as 2003
>Wilson is generally referred to as "CIA" because of his embodiment of the CIA 'character,' and effectively becomes "CIA"
>CIA learns of Bane's mischief and waits for the day to come face-to-face with him
>CIA is at some point stationed in Uzbekistan but has ambitions to gain a post in New York or D.C.
>at this point, CIA is a father of anywhere from 2 to 4 children
>the plane scene is generally accepted to have taken place on January 19, 2013
>CIA survived the plane crash
>CIA was in Gotham when the fully primed neutron bomb detonated
>CIA becomes Deathstroke
>he has solo adventures
We really should be compiling and archiving all the info we see thrown around about CIA as any of it could be true. Then we can maybe piece it together into a timeline and perhaps maybe then unlock another secret in the plane scene and come one step closer to breaking Nolan's secret code and to the prize he has set out for us if we do so.