Elves Aging

[busybee]

"She was little changed, for the mortal years had passed her by"

I think it means that till a certain age the elves constantly change their appearance like mortals do but just slower as arelendil
said about them being 20 but looking 7 and when they reach maturity (whatever that age is for elves) they stop aging in looks and only their sort of aura thingy can really give an impression of how old they are because if they are really wise like Galadriel they can somehow give you an impression that they are really old and have seen loads of things and have learnt much just by looking at them......i think......something like that maybe