Can highschool sweethearts last in this day and age?

It all depends on how much you love him and how much he loves you. Are you willing to commit to him forever? Are you willing to do whatever it takes to keep the marriage together and healthy? Are you willing to say "no matter what happens, I will dedicate my life to this man, I will love him, honor him and respect him." And is he willing to do the same for you?
I have been married for almost 14 years now. I got married when I was 21 to my high school sweetheart. We dated for 3 years before getting married. I would suggest that you date this young man for at least a couple of years. If he truly loves you, then he will not make a huge deal of waiting for you. This does not mean that you two can go dating others. This is a time to get to know him more intimately as a man. (not sex) Grow the relationship, get to know who he is on his good days and his bad days. The two things that will help a marriage more than anything else is clear communication between the two of you and a common faith. If you are a Christian (as I am) then he must be also. If the two of you are of differing faiths, this will become a huge problem later in your marriage. My wife and I have put Christ first in our marriage but it wasn't always like that. We were of differing faiths and it eventually effected almost every aspect of our lives. You must be prepared to dedicate your life to this man, forever. For me and my wife, divorce is not an option. Only death will separate us. We are both Christians and we both communicate clearly with each other. If you get frustrated or upset, take some time and cool off before talking to your boyfriend/fiance. That way, you don't say anything with your emotions running hot and end up regretting it later. Marriage is hard work. It's not a happily ever after movie ending. It can be, but you have to want it and work at it. And so does he. So yes, it is possible to have a lasting marriage with your high school sweetheart. But it's not always easy. I'm blessed to have made it so well. My wife is wonderful and we still have that spark that we had in high school. It disappeared for a short time, but we got it back and we're still going on strong. Communication is the number one problem in most marriages that end up in trouble. I know this has been a long answer but I hope it helps.

I don't think that the marriage is not a good idea, unless you guys have been going out for at least 1-2 years and you know for sure all about him and his behavior because it's hard to trust boys these days and you don't want to end up broken hearted.

I hate to be the one to tell you but they don't always last,simply because people change if that really happens its rear don't get ahead of yourself ur young.Just think about it this way how many girls in middle school say that they "love"the current boyfriend they have.Then months later they break up and she's talking mess about him behind his back.It's like what happened to ur feeling towards him,but I don't want to lie and say that yes they could stay together forever I can't do that.The reason there are so many failed relationships now is because they time periods have also changed and so has everyone.But I say enjoy life right now don't think about marriage how many people have I not heard talk about how life chages once you get married.I wish you luck don't rush into nothing.