A prior adjudication of guilt (the rough equivalent of a conviction in juvenile court) may be used to enhance a sentence in adult court if it qualifies as a prior strike under California’s Three Strikes Law and the juvenile was sixteen years or older at the time of the act. Other prior adjudications cannot be used to enhance an adult sentence. To read more about this rather complicated area of sentencing, click on the following link.
https://www.greghillassociates.com/when-can-a-prior-juvenile-offense-be-used-as-a-prior.html