Aragorn, the Rangers and life spans

[Imbefana]

I know Aragorn's life was longer than most Men, and I've heard of two reasons why:

1) He is the 38th (or something of the like) generation of Elros, brother of Elrond,who chose a mortal life. Elros lived for about five hundred years, and so the lives of his descendents taper slowly from his life span.

2)After the Great Battle in the First Age, the Valar granted the Dunedain the island of Numenor, along with long life and more powers of the mind and spirit than ordinary Men. After a time they became corrupted by Morgoth and their island was destroyed, and all but the Elendili perished. The Elendili then created the Kingdoms of Gondor and Arnor, and the rest is history. [img]smilies/smile.gif[/img]

I've been wondering whether Aragorn was the only Ranger with long life, or if all the Rangers and those left in the Angle were as mighty and noble as those in Numenor.

And I just realized the lineage of the Edain began with Elros, which connects the two reasons I heard, but still: Is Aragorn long-lived because of the Dunedain or Elros, and do the Rangers have the same life span?