Per the Memory Beta article on Jeremy Aster;
As an adult, Aster pursued a career in archaeology, and by 2375 was
working toward his doctorate at the Rector Institute. That year, he
was also involved in a romantic relationship with a woman called
Marra. By the end of that year, however, their relationship had ended.
(TNG novel: Diplomatic Implausibility)
Jeremy would later assist Worf and Alexander Rozhenko in the Genesis
Sector, helping to keep the Moss Creatures from unleashing a new
Genesis Wave on the galaxy. During this time, Jeremy joined the House
of Martok. (TNG novel: Genesis Force)
Aster also became close with Worf's adoptive parents, Sergey and
Helena Rozhenko, and regularly dined at their home. (TNG novel:
He also appeared briefly in the DC Comic "The Lesson"