Depends on the General. If he's a real monster, with like 4 command stars, 10 management and 10 influence, I better don't have him sit idly with the army in my capital...
If he's got the faithful or devoted trait, I trust him much and are normally very happy if he manages to surpass the magic 62/63 years of age border. I he's not so devoted, I normally won't endear him with command over a royal army. No way, unless I have no other choice. When the war is over, he will then retire in a backwater where he eventually gets "melancholic" trait.
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