The increased lifespan was granted to all of the Dunedain, and waned throughout the third age of middle earth. Still, Denethor, no relation to the Kings, was a healthy 88 at the time of the War of the Ring. Elendil's line was descended from Silmarien, daughter of one of the Kings of Numenor, and thus from Elros, Elrond's brother (the fourth I think) Aragorn and Arwen are therefore first cousins, many, many generations removed. I'd guess around 65 if you put a gun to my head and without counting the generations in the book.
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