How long will you live?

Life expectancy is determined by God. He wrote everything about humans long before we came into this world. This is what we have learned from our religious leaders. In most cases, All the kings, queens, presidents, Prime Ministers, Amir, Badshah, Sultan, Prince live longer than the common people. By the way, They eat good food, maintain a Balanced diet. Does life expectancy is determined by God or it is related to a healthy lifestyle?