Here is an interview with Dr. Charles Eugster, claimed to be the world’s fittest nonagenarian.
Here you can see him setting the world record in his age category for the 200 meter run;
For more information on older athletes check out the Silver Grey Sports Club.
peakmemory 
Very inspiring! One commonality I’ve noticed among those who age well is they are phyically, intellectually, and socially active. Diet is not so much of a factor. Thanks for posting this.