If I'm going to answer that question myself then it would be me stating my dreams and ambitions in life and not you, my dear.
Just state on your own words what you imagine yourself doing or having, or how your life would be in the next 50 years from now.
You're maybe a student right now. And who knows, in the next 50 years, you are the principal of your school, or you are a grandparent of 2 millionaire grandson. Whoa, the only limit is your imagination, my dear. So, go ahead and impress your teachers. Tell them how successful you would be 50 years from now. Good luck