In addition to the 19th C didn't end until 23:59:59 31:12:1900, there is also the very real possibility that the oldest person alive can't prove when they are b

In addition to the 19th C didn't end until 23:59:59 31:12:1900, there is also the very real possibility that the oldest person alive can't prove when they are born. Large parts of the world don't have reliable birth records from the 19th C.