Rights of the Roman soldier

[Tiberius Clodius Corvinus]

On your question I found this in Rowan's Osprey Warrior No. 71:

"White haired men, many who have lost a limb from wounds, are in their thirtieth and fortieth year of service. Even after discharge their soldiering does not end, but remaining under the standards [i.e. vexilla veteranorum] they continue to endure the old hardships under a different name."

(Tacitus, Ann., 1.17)