It has been mentioned in several books and newspaper articles, which
unfortunately I don't have here to give the titles of. Possibly a
search of newspaper articles on a library database would give more
details. As I recall, however, this gentleman had a great deal of
trouble calculating his true age, as records in his town were not
kept well back then. But by projecting it based on the details of
his childhood, this is the number they came up with.
I also don't know about that 140 estimate--I'm seeing 120 batted
around as our potential lifespan, barring serious disease or injury.
Sin,
Kathryn Aegis