Like all my careers this requires the XML Injector.
Another in my long list of Sims 4 NPC Careers - the Cottage Living set! All of these are careers except for the Creature Keeper which is just the trait. Just add the trait and apply for the job. The mayor is the highest paying job and I made it based on the Sims 2's version. Yet it doesn't pay as much since this is only a small village.
All are open to teens and can earn you a degree of income. The Crumplebottoms are tied to the Garden Shop and they no longer confer immortality, so if you want Agnes to still be immortal you'll need to set that manually. That said a new one will always spawn so there's that. Of course, like all the others, these are all open to ghosts as well so her ghost may show up so you may still get Crumplebottomed even after her death!