There's a guy out there who can say, "My grandpa was the president." You begin to think of FDR or Truman or JFK, but it's actually President Tyler from the 1840s. John Tyler, the 10th president (1841-1845) had children in his 60s. One of his sons had children in his 70s, and the grandchildren are still alive in 2012. Yahoo News story here.