Ok my neighboor has a question,but I dont know what to say.Ok so shes 11 and she likes a gy thats either 14 または 15 (Im not sure) is that a big age diff???

yea it is

no it is not a BIG age diff 愛 can take あなた away

Mathwise,no, but it would be very wierd and akward if she were dating him.
To others, yes. Yes, it is.

Age is just a stupid number. People really have to keep that in mind. It depends on how mentally mature あなた are. If she IS mature enough for him, then she should go for it. If she's not, then she should at least TRY becoming mature enough for him. Age doesn't really matter and 4-5 years really isn't a big age difference.
My boyfriend is 17 and I'm 14. And everything is going amazing for both of us...

The mindsets of an 11 年 old girl and a 14/15 年 old guy are total opposite... it is a big difference when あなた look at it that way. What the guy wants is sex... and at 11, she shouldn't be thinking about that.