Some are random, some come from what the character does or where he stays (namely the buildings in the respective city) and some are influenced by the parents.
I´m not certain what makes a character long-lived, but in my current Julii game I´ve got a couple of family members of respectable age (almost all got over seventy), most of them from the early generation, the one that had to do everything by themselves, while the following generation tended to expire at an earlier age. So, I suppose to go about in the field is good for the health, at least as long as one doesn´t get killed in battle, of course.
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