This is probably the one thing about Twilight that bothers all the other haters but doesn't bother me.

menatally ,emotionally and physically edward is 17

^No, he's not. Mo matter what Meyer says, its not possible for someone who lived a hundred years to not grow mentally and emotionally.

It is possible if their brain isn't developing.
The ability to mature is a physical growth that takes place in the frontal lobe and it's not fully developed until around age 25.

That is why it's not possible for a very young person to behave and reason like a fully functional adult on a regular basis. Their brain isn't fully developed.

I assume he's a little older than 17, maturity wise, since his experience considerably outnumbers his mentality, it should be compensated in some way. But he's not 100+ years mature.

Yes, there is absolutely nothing wrong with it and there are different stories, good and bad ones, about romance between characters that have a large age difference.

In fictional stories this is the kind of theme that's been used in a lot lately since age gaps in real life seem to main stream in alot of relationships. However this guy may have been alive over a 100 years, but as far as mature wise, he's still an annoying little prick.

Depends on the time setting of the story and if they are both of legal age.

Good thing that in Twilight, they were both of legal age.

I don't agree with it in any story in particular. I always find it creepy.

It's fiction. Also, the age gap doesn't really bother me in this case.

Well, that's just it, they're fictional characters... so it's fine by me.

The main couple in one of my stories has an almost 27-year age difference, so no.

It depends on their actual ages and what they currently want from a relationship. In general, the younger the characters, the smaller the acceptable age gap would be. Also, in a fantasy story like Twilight, you need to judge the characters by their physical age, not the literal number of years they've lived.

^I agree.