Jimmy Carter

The former president is still working to help Habitat for Humanity, even after his cancer diagnosis.
A few months ago, after I celebrated my 15th anniversary as a Googler, and as I looked forward to an impending 45th birthday, it occurred to me that I don't have that many years left and I really need to focus on my two most important priorities.
Carter is currently undergoing treatment for cancer that has spread to his brain.
The former president is 91 years old.
It doesn't get much sweeter than this.