Could Eli grow older? *May contain spoilers*

[rgh]

I don't think there are any circumstances under which Eli would suddenly start aging, nor would I want there to be.
Eli wouldn't be Eli for me if he wasn't the forever 12 year old that he is.

Good point. An Eli that ages just isn't the same, it would fundamentally change her.

[rgh]

Eli is only very young as far as vampires go, who know what would haven over a few thousand years or more.

one of my favourite vampire mythologys is in the Legacy Of Kain series, the vampires don't age, though they do evolve over time.
Legacy of Kain: Soul Reaver intro: http://www.youtube.com/watch?v=lFiLNc46jAM one of my fave game intros of all time.

another favourite immortal of mine is Doctor Who character, Captain Jack Harkness who over millions of years completely changes his physiology to become the Face of Boe

Given what we know about Eli, that she cannot age mentally or physically, I am not sure that she can evolve (much) either.

Edit: Re-read the post, who knows what could happen over such a long period.

[Angelmaker]

I don't think there are any circumstances under which Eli would suddenly start aging, nor would I want there to be.
Eli wouldn't be Eli for me if he wasn't the forever 12 year old that he is.

Good point. An Eli that ages just isn't the same, it would fundamentally change her.

It would change her but I think it's what she has wanted for a very long time. Oskar is her portal to the normal world that she has missed for so long. Also changing Oskar fundementally changes him