What is the wish you would becomea Puella Magi for?

The wish which i would give away my soul for would be EVERY (good in their heart)people can't die so young first when you're supposed to die with 80,or 90 years age,not as a baby or kid or teenager or young man.and when your time is up i want everybody to have peacful and happy death! That is my wish and i don't care if i die as a puella magi as long as my wish stays granted forever.