I don't think so. People who start wars don't fight in them.
Good point. And I guess that people who never fought before are the most eager to send others to fight.
In more noble times the leaders led their troops in battle.
True but if the age of soldiers goes up .....
Larry Niven in his "Ringworld Novels" give a pretty good account of the results of increased longevity. You keep meeting people (and wives) you knew long ago and the longest lived seemed to be the most risk averse (cowardly).
What a difference if individuals and societies began to realistically think of goals centuries and not decades in the future. Hey I might even live to see a man on Mars or even another star system.
"I don't think so. People who start wars don't fight in them."
I used to believe that propaganda until I started reading up on it. It turns out that wars are most popular with young males. They have the least to lose (because they have not accumulated much yet) and the most to gain (glory, status, treasure, women). It is the old and established that are reluctant to start wars.