Why Is He Younger Than Me??

Erm...I think lots of people might heve this feeling...well, it goes the same with me.. I can't say that I am totally in love with him..but I guess that I have a big crush on him..
It's started during the first semester of school.. actually, when I first met him, I never think that I will be interested in him..but, all things went totally different..during one of the school's activity, I've found out that he is damn cute...my heart started trembling....haha..it's a crush~!!
when i told my friends about this thing, some of them said -"yeah..whoever you like,we will support you..." but, some of them also~~"what?4 years younger than you...he is still in form 1 and you are form 5...it's just not right.."
duhh...well..i don't care about it.. what matter is I like him..and he already know that I like him..waa..I always blushed whenever I meet him..
and my messanger(the one who told him that I like him) said that he likes me too...yay!! and it is proven when he gave me a ring.....
well,,for me..he is still not very matured yet.. hence, I just make him as my "adopted brother" or whatever you wanna call it...
It's just...why he is younger than me...? if he is older than me,,maybe we will be a lovey-dovey couple...!! as if~~

p/s: sorry if my grammar is suck!!