Constantine XI Palaiologos was born on February 8, 1405 and died on May 29, 1453. Constantine XI Palaiologos would have been 48 years old at the time of death or 607 years old today.
This answer is closed to changes. This is done in rare cases when questions are being vandalized or answers have become debates. E-mail reopen @ answers.com (no spaces) if you would like it to be reopened.
Constantine the Great was born on February 27, 272 and died on May 22, 337. Constantine the Great would have been 65 years old at the time of death or 1740 years old today.