In the Severan period the proconsulship of Africa or Asia was normally held some 15 to 17 years after die consulship. Although there are comparatively few consuls in this period whose ages can be firmly established, what evidencethere is suggests that the consulship was normally held in the early forties, on occasions as early as the mid thirties: a consularis could, therefore, hope to attain a premier proconsulship aged about 60. Thus the future emperor P.Helvius Pertinax, who was born on 1st August 126, held the proconsulship of Africa, probably in 188/9, at the age of 62. M. Didius Julianus, the imperial successor to Pertinax, also succeeded him in Africa aged about 56. C. Vettius Sabinianus was born before 136 and his proconsulship fell about 192/37 whenhe was at least 56 years old.