HOW LONG WOULD YOU GIVE THIS RELATIONSHIP!?

[peanutbutterjellytime]

the girl is 19 the boy is 17 they have been dating about 2 1/2 weeks- 3 weeks now and they have been "talking" about maybe 1 month at the most before they started dating. they already say i love you to each other and put a bunch of twitter statuses how they are in love. when they don't see each other for a day they say how much they miss each other even if they just saw each other that day. Both their parents approve of the other. people tried to break them up already and they're still together and they post on twitter how they can get through anything and still be together & stand strong. (which they haven't even been dating a month and they didn't even go through anything too bad) also the girl puts how "people tried to break them up since day one and they're gonna be together for a long time" They seem obsessed with each other.
PLEASE DONT SAY STUFF LIKE HOW SHOULD WE KNOW, IM JUST ASKING FOR OPINIONS THANK YOU!!

[girl]

it might've been love at first site

[john]

it depends on how much the girl is putting out.

[C]

why are you bothering with someone elses relationship? get a life of your own...it's better anyway. you can never tell how long someone elses relationship will last...things happen from day to day.

[Raen]

Could be a year, could be forever. The truth is it's hard to tell in the beginning. But if they get along great, then let them get along. My relationship with my fiance was foretold in the beginning that it wouldn't last over 2-3 weeks. And we've dated for 4.5 years and are now on the verge of marriage. And my parents actually didn't approve of him at first (because of his race), but now they get along with him just fine.

[Zoldoran Cruz]

This happened with my last ex. We both really liked each other a lot and didn't talk a lot before I asked her out. We broke up after two months after we had sex and where bored in the relationship. I give it a month to a month and a half