The custom of the Northmen reveres the life of war. Verily, these huge men fight continually; they are never at peace, neither among themselves nor among different tribes of their kind. They sing songs of their warfare and bravery, and believe that the death of a warrior is the highest honor.
Now this is in line with what we have seen (and know) of the Viking. They sure loved to fight (and found honour in even death as a result). Dying of disease or old age is for the weak and feeble.