Aldor the Old was
Brego's second son and also one of the
Kings of the Mark. Because of his advance age and the fact the held the
crown for 75 years, they called him
the Old. During his
reign, the
Rohrrim increased, and drove out or subdued the last of the
Dunlendish people that lingered east of
Isen. Of the next three kings little is said because it was all peaceful.
This was taken from
Appendix A of
JRR Tolkien's
LOTR