31 is not too old. Yes, it's older than average, but well within range. You can go for any program which you see fit. And you have an awesome GMAT, so you will be off to a better start than most!

Well Monika,
The important thing when coming up with your goals is that they make sense in terms of what you are doing now. So, although it's true that an MBA is an opportunity to change, if you can show good continuity between your past and your goals it will always be better. So your idea of moving into management in Tech makes total sense. What schools can you go for? Well, the first place to start is schools with strengths in your industry - Haas, Anderson, Tepper, McCombs, etc. But of course it doesn't mean a good, solid MBA from a General Management program at Duke, Ross, Tuck and the like can't be great even if their specialization is not tech.

Hope this helps!

Monika,
I think it's realistic as long as you would stay in the industry in which you have experience. If you were gonna tell me strategy in the food and beverage sector, I'd say no, but staying it tech, you should have no problem building a logical story.