Answer:
(I don't know if you're looking for a specific answer but I'll try anyways :3)
1).To me, happiness is the key to a long life. If a person is not happy, they are more likely to passing away faster.
2.) I prefer a life of long-term happiness. I chose this because I would not want to be a sad person, mainly because I feel that sadness could be contagious at times. I would want everyone in my life to be happy along with me.