I think they look older only for the same reason Aragorn and the Dunedain looked haggard and grim-endless years of strife in defending the world from the enemies. The Dunedain were said to be fair, but grim. They made the Rohirrim look like mere boys. And they were descended from Elros (Elrond's brother to the layman). So sure, that mortal sorrow and worried appearance may have shown a little.
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"I come from yonder...Have you seen Baggins? Baggins has left, he is coming. He is not far away. I wish to find him. If he passes will you tell me? I will come back with gold." - Khamul the Easterling
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