The Titans version of Dick Grayson is starting the team in an attempt to get out from under his mentor’s shadow, which has always meant that he’s likely to be at least a young adult, but the casting of 13-year-old Teagan Croft as Raven could have been a sign that the rest of the heroes would be younger and therefore unlikely to hook up with an adult Dick Grayson.
The casting of Anna Diop may indicate that Croft will be an outlier, and the rest of the team — aside, perhaps, from Beast Boy — will be older.
We may have to wait for further castings to find out for sure.