Still though the alternate timeline does not explain the differences in the characters. I can live with things not looking the same and whatnot but the characters themselves arent the same...
Sure it does. The characters, especially those born after the timeline change, aren't necessary the exact same people seen in TOS. Spock's life experiences could have been difference if Sarek's diplomatic experiences were different as a results of the Kelvin destruction and the Federation's subsequent knowledge of and contact with the Romulans. Chekov's parents decided to have a kid two or three years earlier than the original timeline but still used their favorite name for their son. Uhura was inspired to study languages instead of taking classes in communication systems technology because of officers who know Romulan are in demand now. Scotty was on a different career path due to Starfleet's interest in data collected on the Narada by the Kelvin crew. And so on...
I understand that. (Though I thought Chekov was 17 so his age is about right.) BUT they deviated to far from the orginal characters IMO. Why would old Spock even assume there will be a friendship between Kirk and Spock if alternate universes caused by one ship getting destroyed changes things right down to the basic attitudes of people. Again I still thik it was a poor plot device and really dont relish the fact that we will now be watching a universe, manufactered by Spock and Nero, for the forseeable future. I would much rather have seen a new but familiar take on the franchise with a clean slate. No ties at all to the other series and films except inconcept. No need to spend half the story with a plot device to shoehorn all that came before to try to appease some fans.