How do you use appositive? Your article should follow the name of the profession, but you wouldn’t use it when the situation is reversed. Typically, you’d use

an article when the appositive follows the proper noun; note the article before the profession. Two

18-year-olds, a mechanic, Ron Smith, and a hairdresser, George Major, were arrested yesterday.

Two 18-year-olds, Ron Smith, a mechanic, and George Major, a hairdresser, were arrested yesterday.

Your example: Profession as appositive without article, but I would argue that, without the article, the uses here are best viewed as adjectival. In which case they are indeed allowed. Two 18-year-olds, Ron Smith, mechanic, and George Major, hairdresser, were arrested yesterday.

Assumption (concerned progeny) basic form, standard form, and actually more concise A pair of 18-year-olds, mechanic Ron Smith and hairdresser

George Major were arrested yesterday afternoon.