[Pink-chan]

Originally Posted by Koshimizu

I think the reason why they design Lelouch with longer hair is to show that he's still growing.

Spoiler for I think:

Geass user will continue to grow until certain age. Or does it got to do with the empty one year when Lelouch lost his memories and had his geass sealed which allowed his continued growth? But Mao did grow up for sure.

Unlike C.C., who's not aging nor changing. For Rai...

Spoiler for my guess:

I think it's because he's been sleeping all the time after that tragedy, until Bartley wakes him up. And he's sleeping in the Geass ruins, which may have some effect in keeping him this way.
BTW C.C. mantioned those who loved her or hated her are all washed away in the river of time, and she's left alone. If they don't die of age, then she'd have to kill them one by one... Which I don't think that the case. *sweatdrop*

Spoiler:

How can Rai make himself sleep for so many years I wonder? C.C. need not kill them one by one as they are most probably killed in one way or another during all these years which C.C didn't realise that. How many contractors does she has for all these years which is what we didn't know.