The Numenoreans were given the extended lifespan because their forefathers opposed Morgoth in the First Age and fought against him with the elves. Not all of them were descended from Elros, so most of them were normal humans.
The line of Elros Tar-Minyatur were given an even longer lifespan partly because of the elvenblood that flowed in their veins, but they were still mortal because Elros chose to be mortal.
Normal Numenoreans lived less long than the line of Elros.
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