Photo from web)
Most important is to inherit healthy genes from your parents.
More good luck:
Have no serious accidents
Catch no life threatening diseases
Avoid lethal food poisoning
(What you have some control over)
Avoid/Limit Poisoning yourself with:
Eating excess fat, salt, sugar
Have a healthy diet that fits you personally.
Checkups with Doctors, Dentists, etc.
Social Contacts (Family and Friends)
Meaningful Life Purpose
Avoid Stress. Get enough sleep, etc
There must be more.