Origin – Veterans

Inveterate, from Latin vetus, old, generally indicates disapproval.
Inveterate gamblers have grown old in the habit, etymologically speaking; inveterate drinkers have been imbibing for so long that they, too, have formed old, well-established habits; and inveterate liars have been lying for so long, and their habits are by now so deep-rooted, that one can scarcely remember (the word implies) when they ever told the truth.
Latin senex, source of senile and senescent, also, you will recall, means old. In inveterate in- means in; it is not the negative prefix found in incorrigible.
The noun is inveteracy or inveterateness.
A veteran as of the Armed Forces, grew older serving the country; otherwise a veteran is an old hand at the game (and therefore skilfull). The word is both a noun and an adjective; a veteran at (or in)swimming , tennis, police work, business, negotiations, diplomacy – or a veteran actor, teacher, diplomat, political reformer.
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