The only TOS characters whose ages were definitively established were Kirk (34 in "The Deadly Years"), Chekov (22 in "Who Mourns for Adonais?"), McCoy (137 in "Encounter at Farpoint"), and Scotty (chronologically 147 in "Relics"). The other characters' ages were only conjecturally given in the Okudas' Chronology. The only core character whose age in the Abramsverse is inconsistent with anything we know from canon is Chekov, who's 4 years older in the new timeline. Kirk's birth year is the same; Spock is slightly older, which is consistent; and McCoy and Scotty are mid-30s just as they should be. Uhura and Sulu are older in the movie than the Chronology speculated they were, but it wouldn't be the first time the book's speculations have been "disproven" by new productions.
The only other character whose age might be inconsistent is Pike, since the first movie took place only about five years after when "The Cage" would've taken place, creating a discrepancy of at least a decade between Jeffrey Hunter's and Bruce Greenwood's ages. But since we don't have canonical ages for either version of Pike, it could be that Hunter was playing 5-6 years older and Greenwood 5-6 years younger. And it's not like we haven't had casting discrepancies before, like James Cromwell being far older than Zefram Cochrane should've been as of 2063.
Hey man, read the first chapters of one of your books online. Pretty good!
So Kirk is now 8 years older rather than 12 years older?