Quote Originally Posted by thubby View Post
worrying about physical age for different species is a bit silly. same with immortals.
what's important is that both parties are of the same maturity.

in humans, the difference between someone 50 and 60 is fairly small. the difference between someone 16 and 21, despite being a smaller span of time, is HUGE.

so putting celestia with twilight seems odd, but it wouldn't in 10ish years.
Maturity is one thing; something more than a thousand years of extra experiences is quite another. That there could be feelings is perfectly plausible, and maybe even that Twilight could try to act on them, but I can't see the Princess letting it get very far.