No source gives a birth year. His exile in 347 is documented in the imperial and conciliar record, but the death is placed around 355 only by later writers arguing against his church, and no burial place is recorded. The standard reference works print both dates as approximations.
What would resolve this An African or Gallic epigraphic or documentary find naming him with a date, or an unremarked notice in the conciliar and imperial correspondence of the 350s.
OpenLate Roman prosopography and North African epigraphyW. H. C. Frend, The Donatist Church: A Movement of Protest in Roman North Africa