My list is too long, but here are some of the top ones.
Thankful for surviving long enough to be old and yet still in pretty good health.
Thankful for my family
Thankful for being born into a family that taught me how to take care of myself, being born with the tools to that, and for the wisdom to know I should share my success with those not born with the tools or the family support I was.
Given the above I am also thankful for being a USA citizen and...