The "tittle" of Elder is a relic of long time past,always important on the culture of the Mazemakers since the times of King Birold "The Maker" himself its role has drastically changed since the Scouring of Lorath and Erreg's departure.
Once an appointed Elder could be selected according to the deeds the gentleman (or sometimes ladies) did for the community or on a noble's case on his own ascendancy,the major honor for an Elder was to take part in the Sacred Council of Elders responsible of electing the ruler of the Ancient Kingdom of Lorath.
Only a member the Noble Houses of the Kingdom could be appointed King of Lorath and Legacy of the Mazemakers, tittles beared mostly by House Blurson specially after the Scouring.
On the other hand on the Blue Kingdom in the North of Westeros used this tittle on a different way,being appointed Elder nowadays is similar to the roles of Knighthood,charged with the preservation of the Maze Spirits and the people of the Stony Shore and Sea Dragon Point, sometimes Elders are delegated land by Noble Houses, creating scions known as "Elderly houses",this promoved by the Blue Kings for a more efficient administration of the land in the old Kingdom up to the 298 AC.
This reform applies to the hereditary tittle of Erreg's blood "Eternal Elder",man who did see the faults of the old Sistem,as the Order of Masters and Scholars usually say it was the old Elective Sistem that contribute to the old Kingdom's stagnant nature and lack of stability as when all nobles had the possibility of being elected corruption, intrigue and disrespect ruled on the council sometimes not taking their job seriously or putting puppet rulers that satisfied their aim as being Kingmakers dated their heads with arrogance and grandeur, saving a legacy nearly rotten by Qarlon's Claim or the tyranny of the old council.
As the Andals and the Mazemakers must have hated each other but for all their contact they acquired crucial point to both their cultures.
A continued line of rulers also helped in a competitive and an active history on the lands of the North, remember the past create but also learn how to destroy.