Board Thread:Theories and Rumors/@comment-26748383-20180724024236/@comment-35245651-20180812070941

Fact, interspersed with my opinions:

For the masters introduced in Season 4, oldest to youngest: Neuro and Bolobo are likely the oldest, followed by Jacob Pevsner, Gravis and Karlof; then Paleman; followed by Shade, Ash, and Griffin Turner; then Chamille, Tox, and Skylor. I'd say all of them are older than the Ninja (except for Zane, who is at least 50 years old).

Zane is the oldest Ninja. Kai, Cole, and Jay are approximately the same age, followed by Nya, and then Lloyd.

Wu and Garmadon are both a couple centuries old.

Morro is likely much older than all of the members of the Elemental Alliance, save for Wu and Garmadon. Although he is dead, he is the current Master of Wind.

Krux and Acronix are approximately the same age as most of the Elemental Alliance.

The Overlord is the oldest living elemental master, being milennia old.

As for the main Sky-Pirate crew, they are a few centuries old as well, and are all humans save for Clancee. The reason for their longevity is unknown, but has likely to do with whatever realms each was banished to. Serpentine life span is unknown, but it seems they live longer than humans. It is possible that Doubloon and Dogshank's mutations allow them to live longer than humans, as does Monkey Wretch's cybernetic nature. However, this does not explain Flintlocke's longevity.