If they come of age in Hellas, they go to Athens for a few turns, not to long, just until they got some ancillaries. Then I take a longer look at them, regarding their basic characteristics. Clever and healthy ones, or vigorous ones can become General if there's a vacancy - what's rather seldom. Putting down the occasional rebellions has to be done by the next governor with his local forces. Such minor tasks can be performed by everybody, even a 60 year old couch potatoe. The ones who won't become General are looked at regarding their ancillaries and traits like "miner" or "happy people", and go to an appropiate settlement.
Dull/Uncharismatic/Vigorous, weak-chinned, falling sickness, administratively inept => have a nice time in Vindobona.
Sharp/Charismatic/Langorous, tax assessor, very happy people, merchant, rhetor hellenikos => go and become Satrap of Antiocheia.
Basically they stay where they are until the end of their lives. Generals can retire once the war is over or the campaign is over or they are permanently needed in a far-away city. For example, I have a general who conducted the whole Getian War (after his brother betrayed me and became a barbarian) but got the "uncomfortable supervisor" trait for every barbarian village he conquered. The Basileios honours his service with the Tyrannis of the island of Lesbos.
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