I wake up in the morning saying to myself "May all beings attain Bliss and the cause of Bliss"

 I find this is very healing to do. It causes healing in your own body which is what happens whenever you have good thoughts they heal your own mind and body first.

Just like whenever you hate someone else it harms your mental and physical health first and really often does nothing to those you hate.

So, for longevity learning to think kind thoughts about yourself and others will extend your life and theirs too.

Kindness continues life on earth and hate ends life on earth.

So, when we think and feel kindness we tend to prevent human extinction as well as the extinction of all creatures on earth.