Old news much? Reki pretty much explained that on twitter weeks ago.

Don't be mean xD He got it by reading it on his own haha.. Even Reki didn't say what it stood for, he just that it was the northern-most region, and that the number represented the order they were born in.

Sorry if I sounded mean, but I hate when people necro random posts for pseudo-new news.

heheh... it's okay. i don't look at Reki's post and i noticed only after reading Alicization 3+times

and i wonder what's Alice's ID... so we can say who's older than who

I don't think the Web Novel ever mentioned Alice's ID. Pretty sure only Eugeo and Kirito were mentioned. Of course, that could change in a later volume of the Light Novel.

don't we atleast have birth months for the characters though? or weren't they given for Eugeo and Alice? if we can use that as a given we could just take a good guess.. though I'd have to say Alice is older.

I don't think we have anything of the sort. Might be nice, but we're probably not getting anything any time soon.

We only have an approximation of the birth year based on their age in vol 9. We weren't given anything as convenient as birth months.

And I personally think that the question about who was Kirito's UW parents would be more interesting :D

if i remembered correctly, it said when Kirito's memory was still blocked, it said he lived in the church.

That doesn't change the fact that he had to be born somehow, unless he was created out of nothing and that's not how the system works.