That's too bad about the age limit. You could change to a program that you can complete by the time you're 22, but I'm sure you've considered that.
> I do not think i have another chance of getting 100K like that again.
I certainly am in no position to make recommendations (nobody is), so I'll add some general observations:
1) You'll have other chances at $100K (if you're someone who has the skills to build companies). It's a good opportunity, but $100K investments aren't once-in-a-lifetime for a moderately successful entrepreneur. In fact, I would guess that the social capital, the network, is worth far more (and will yield far more investment than $100K).
2) Life will not work out at all like you plan. That doesn't at all mean that you shouldn't pursue goals and dreams, but I wouldn't be too rigid about any particular opportunity or outcome as the only option, do-or-die. Most startups fail; many others end up doing things their founders never expected. And life is much more than startups and work. Enjoy the ride.
I hope whatever you choose turns out to be a fantastic experience.