This above file is completely unreliable. I have contacted Ancestry twice about this but it still remains up and active. It should be thoroughly distrusted for accuracy. Go to the site and do not enter anything except a birth year. Enter 1855 +/- 5 years and watch what comes up. You will notice that pretty well all of them lived well past 100 years of age, many dying at age 127 years and older. I doubt they found the key to excessive longevity. It would be nice if a number of us complained about this as many will just blithely add this information to their public trees and further compromise the accuracy of their family history.