Sorcerer is the highest rank. The previous rank being that of the Enchanter.
Sorcerers have a life expectancy of 175 years, almost three times that of a layperson. At that age most Sorcerers retire from the Guild of Enchanters and become Magician Emeritus or Conjuration Consultant long before they become bicentenarians.
At the age of 200, Belboz was the oldest member of the Circle of Enchanters, and was the oldest guildmaster ever.